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Optimus Prime wasn’t good at confrontation; physical, verbal, emotional- none of it. So, as he stood with his digit hovering over your doorbell, he could feel his spark beating in his throat. His anxiety was killing him, and the part of him that was so anxious was tempted to just turn around and walk away.
He could save it for another night, couldn’t he? ...No, he couldn’t. He’d been telling himself another night, just one more night, next week, later for months now. It was time.
Now or never.
Three, two, one-
With a sharp inhale, Optimus rung your doorbell and wrung his servos together in front of him. He could feel his faceplates burning red with a heavy blush as he waited for you to open the door, but thankfully, he didn’t have to wait for too long.
The door slowly came open, revealing you behind it. You wore a (f/c) robe that was loosely tied, revealing part of the white teddy you wore underneath. It took everything in Optimus to tear his optics away from the beginnings of the chest that he so desperately wanted to bury his faceplates in, but when said optics landed on your face, graced with a sultry smirk and lustful (e/c) eyes, it didn’t help.
You grabbed his servo with one hand and pulled him far enough inside to shut the door behind him before pushing his back against it- and, of course, he let you. The second you went to lean up and kiss him, though, Optimus shook his head and pulled away.
“We can’t keep doing this.”
“You say that every time,” You rebutted and rested your hands on his hips, gently massaging circles into the metal plating with your thumbs.
It was true, and he knew that. Every time after the first time you two had met up like this, he’d argued against it, but you always pulled him right back in with your charm.
“No, I mean it this time,” Optimus stopped you, a bit awkward as he placed a servo on your shoulder and backed himself further up against your door to put some distance between the two of you. He wasn’t ready to do this. He wanted to keep you forever, but it wasn’t fair to you. You deserved better and he needed to tell you the truth. “We need to talk.”
You seemed to know what was coming, so you pulled away and crossed your arms with a huff. Your eyebrows furrowed.
Honestly? The situation was uncomfortable. Optimus could see the candles lit in your house, smell the perfume of yours flooding into his olfactory sensors, and the lingerie under your robe... You’d assumed he was coming over to interface with you like usual, and as much as he wanted to, he used all of his willpower to resist the urge in favor of watching you storm over to the living room couch. You plopped down onto the corner seat in a dramatic fashion with your arms still crossed.
“At least come in and sit down here if you’re going to do this to me tonight, Optimus. I’d rather you not do it in my doorway.”
You knew, and he knew. Shaky in his movements, the Autobot locked your front door and walked over to your couch so he could sit next to you.
Your relationship had always been complicated, to say the least.
It started when him and his team had started battling the Decepticons on earth. With all of the news coverage they received, they were well-known amongst politicians, media outlets, law enforcement, and citizens in Detroit, and the Autobots had not only captured their interests, but yours as well. You were a scientist interested in doing studies on Cybertronian creatures to figure out what they were and how you could apply them and their technology to life on earth. There were plenty in the scientific community who were interested in them, of course, but you were the only one who had written a heartfelt letter about the matter, promising not to do anything too inhumane- the occasional metal sample, recharge studies, strength tests, and so on.
Then again... You’d included a picture of yourself in your first letter to the base, and that may or may not have been what captured Optimus’s attention initially. But then he met you and allowed you to conduct your experiments with Ratchet as your assistant on base, and not only were you gorgeous, but you were smart, creative, kind, easygoing, loving... You were everything Optimus Prime wished he was. So, even when the experiments stopped and you moved onto your next project, you still came around the base and Optimus still came around your house behind his teammates’ backs.
‘Why is she still here, Prime? Her study’s over.’
‘Yes, I know, Ratchet. She’s just... Helping me with some things.’
Ratchet commented on it the most, skeptical as always. Bumblebee always asked where he disappeared to in the middle of the night. Prowl was starting to get concerned by how tired Optimus seemed, and Bulkhead was the one who constantly snapped him out of his lovestruck dazes when he got caught up thinking about you.
The first time Optimus Prime made love to you was still a blur. He had developed feelings rather quickly, but it wasn’t until months of building up the courage to make a move that he’d finally done something; shown up to your house in the middle of the night and taken you into his arms the second you opened the door. It had escalated from there with you wrapping your arms back around him and pushing your lips against his, slamming the door shut behind the two of you and tumbling in a pile of warmth and metal onto your living room floor without any regard to how sore you’d be the next morning.
It had turned into a regular occurrence after that. Optimus showed up to your house, showered you in kisses and praise, and the two of you would interface, no matter how hard he tried to resist. And trust me, he tried to resist because he knew in his spark that it wasn’t right.
You’d shared your hopes and dreams and body with him, and he didn’t want to let all of that go, but how could he love what he didn’t deserve in the first place?
He was putting you in danger by being with you, anyway. Being with you was selfish, especially considering that neither of you had dared to say the ‘L’ word or put any sort of label on it. It was just the two of you spending an increasing amount of time together, talking, making love, falling in love when there was a good chance of it failing in the end. And both of you knew.
“It’s hard for me to come out and say this,” Optimus started. “But I love you, and I know you feel the same way.”
Your reaction was surprisingly restrained. No denying, no deflecting, nothing except for a small nod. You allowed your (e/c) eyes to fall shut and took a deep breath before speaking.
“I do.”
“It’s remained unspoken for far too long, but part of the reason I haven’t addressed it is because you deserve better,” Optimus reached over and set a servo on your thigh, offering a comforting squeeze, though that seemed to do nothing. You flinched, not even able to look at him for a moment. “I know it hurts, but you’re worth more than this... (y/n), darling-”
“No, you don’t get to tell me that after everything we’ve been through, Optimus,” You hissed, finally gathering the courage to look right at him, (e/c) burning into aquamarine. “Why do we do this to ourselves?”
“I don’t know,” He confessed with a half-hearted shrug. The simple answer was because the two of you loved each other and didn’t want to let go, but the complicated answer was... Well, complicated. “But what I do know is that I don’t want this for you.”
“Then what do you want?” You snapped.
Optimus understood. He had no right to dictate your life, your romantic interest, or anything else about you; you were a strong, intelligent woman with your own hopes and dreams, and unfortunately, he somehow fit into all of that for you. Still, he answered your question honestly.
“I want you to go live a normal life; meet a human, start a family or get married, stay single if you want, even. I don’t want you to get too attached to me and regret it when you start thinking about the little things later down the line... If you stay with me, you’ll always be in danger, we won’t be able to have sparklings of our own, and I could leave you here on earth or die any day now. Is that what you want, (y/n)? You can still leave me-”
“Are you stupid?” You asked, which made him blink.
The Prime hadn’t expected for you to be happy about this, but he hadn’t expected for you to outright insult him either, let alone call him stupid.
“What?”
“Do you think I would’ve done all of this with you without considering the consequences!?” You raised your voice and jerked away from him, holding a hand to cover your chest, offended. Optimus took the hint and pulled his servo away from your thigh to avoid angering you further.
He crossed his arms in frustration.
“You know what? Yeah, I do,” He answered. “Because you care about me too much to realize how big of a mistake this is going to be if we go through with it. Let’s say you’ve fully thought this through and don’t care about anything I’ve brought up- even if that’s the case, I’m not good enough for you, (y/n). I’m so large compared to you that I’m afraid I’ll hurt you one of these days, I’m selfish, I’m inconsiderate, I mess everything up at every turn, and Primus, I’m so unattractive-”
“Is that where all of this is coming from?” You asked, suddenly a lot more quiet, and Optimus winced at your tone. “I knew something was up, too; you’ve been keeping the lights off when we have sex and most of the time it feels like you can’t look at me anymore, but I... I thought I’d done something wrong, why couldn’t you have told me earlier that you were feeling like this?”
You were giving him the look; (e/c) eyes peering up at him, full of love and passion and so much more that was burning into his processor to make sure he wouldn’t ever forget it.
“Because I knew you were going to react like this- I knew you were going to look at me like that and tell me I’m wrong about myself, and it’s making it ten times harder to break it off with you, but what I said is final. Being with me is dangerous, you deserve to live a normal life, and I’m not good enough for you-”
Optimus’s self-deprecating rambling was cut off by you throwing yourself into him, wrapping your arms around his neck and holding on as tight as you possibly could. He uncrossed his own, unsure of what to do with them- he didn’t want to hug you back and give you the wrong idea, but he so desperately wanted to feel your warmth on his digits and palms.
“Shut up! Have you ever thought that facing our problems head on would be better than giving up everything we have?” You argued, pleaded, voice cracking as your tears fell onto his shoulders. “You think that being with me is selfish, but what’s really selfish is you not giving me a chance to make this work! You’re wrong, Optimus-”
“Leave me, (y/n),” Optimus reached forward and caressed your cheek with a servo. The amount of tears he found himself wiping away with his thumb made him frown- was this really for the best? Was he in the wrong here? No, this was exactly why he had to go through with it; whatever hurt came from this point on would be much, much worse if he allowed your relationship to continue. “I know you’re hurting right now, but you’ll thank me later. Cut your losses and leave. Go live a happy life, fall in love again- with a human- and focus on your work.”
“I can’t do it, I’m sorry,” You apologized, only making things worse. The fiery anger that you had expressed initially was fading into something much more melancholy as you hung onto him tighter and buried your face into his neck. “I love you too much. If you really mean everything you said, and you don’t want to be with me, push me away; I’ll leave, and we’ll never talk about it again... If that’s what you really want. Push me away, Optimus.”
“You’re making this harder than it needs to be, (y/n), I...” He stopped when he heard you sob into his shoulder, the sound muffled by his metal plating. Part of him knew that if he had to leave earth in the near future, the impact would be more severe on you than this, but he couldn’t see and hear you cry and push you away like you had asked him to. He couldn’t leave you, couldn’t let you go, no matter how much he hated himself for it. “Oh, to hell with it, I can’t do this anymore- So what if it’s selfish?” Before Optimus could stop himself, he found himself moving his servo from your tear-stained cheek to the back of your head, wounding his digits in your (h/l) (h/c) hair and dragging you into him for a heated kiss. You hummed and leaned into it without hesitation. Optimus sighed through his nose when he felt the tension leave both of your bodies, your hands resting on the side of his neck, his spare servo resting on the small of your back to support you and hold you close to him. Your much smaller lips molded into his the best they could, tasting of sugar and a human spice called cinnamon as you swiped your tongue across his bottom lip plate. His servo in your hair ran through the locks and wrapped them around his digits to yank at them- heat consumed his body to the point that his cooling fans were already turning on with the feeling of his spike pushing against the constraints of his interface plating. After what felt like forever yet not nearly long enough, you pulled away from Optimus and looked up at him, lips swollen from the intensity of your kiss. “I love you.”
“I love you, too,” You responded, a little rushed.
“I’m so sorry.”
“Don’t be,” You choked out, sniffling and clearing up the remainder of your tears before shedding your robe and kissing his neck, cautious and soft yet needy and desperate. The white teddy contoured your body perfectly, hugging your plump ass and highlighting the shape of your breasts as your nipples perked up against the lacy fabric. Your sides were exposed by the slits cut into the outfit. Optimus found himself drawn to the exposed (s/c) skin instantly, so he rested his servos on your hips and took a deep breath in. You were so small compared to him, too; both of his servos covered the entirety of your waist, back, and stomach when he had them like that, and oh Primus, he could already imagine how you’d look splayed out underneath him with his spike buried in your core. He was sure that if he didn’t open his interface panel in the next few minutes, he was going to burst. “I need this, need you... Optimus.”
The next few minutes were wordless, with Optimus picking you up and carrying you to your bedroom. There were candles lit there, too, and while he was sure that was a fire hazard, he appreciated your attempt to set the atmosphere- even if it had been temporarily squandered by his earlier spiel. So, he shut and locked the door behind him and followed that with gently setting you on the edge of the bed.
When he kneeled on the floor in front of you, you blinked your (e/c) eyes, (s/c) cheeks lit aflame when he took your hand in one of his and pressed a kiss against your knuckles. And, as he looked up at you, he realized something; maybe he didn’t think he deserved you, but you deserved him if that’s what he wanted, and instead of shoving his own self-deprecating sentiments down your throat, he wanted to try to be more thankful that he had you, wanted to stop worrying about what was ahead and enjoy what he had in the moment.
“(y/n), I want to tell you everything tonight, I...” Optimus cleared his throat and continued to hold your hand as he leaned up and nuzzled your neck. “I’ve never loved anybot or anyone like I’ve loved you. I don’t think I could live without you; without the mornings I wake up with you and bury my face in your hair, without the feeling of your skin on mine, without seeing how the sunlight pours through the windows and onto your skin when the sun rises and how your lashes flutter against your cheekbones when you wake up-”
“Make love to me,” You cut him off, looking up at him, and oh, how he could see the utter love and adoration in your eyes. He wondered how such a small being was capable of holding so much love for him, but he didn’t dare question it, doing as you’d told him and reaching up to unlace the front of your teddy, the ribbon that kept the two halves of the front together coming untied underneath his nimble fingers within seconds. It fell off of the upper half of your body, revealing rounded shoulders and supple breasts, a soft tummy and feminine hips. You didn’t hesitate to lift yourself off of the bed just enough to pull the rest of the lingerie down your body and kick it across the room. Now, all of you was exposed from head to toe. This was the point at which Optimus would usually get on the bed and pick you up by your waist, pull you over so you could sit on his faceplates, but he was so emotional and pent up at this point that he knew he couldn’t wait that long to be inside you. “Hurry up, please? I’ve been thinking about this all day.”
The Autobot gave you a nod and stood up, so you laid down with your back on the bed and watched him open his interface panels. He couldn’t help but watch your face as he released his spike, already fully pressurized- because no matter how many times the two of you had done this, you always seemed to be taken aback by the sheer size of it, your cheeks glowing red and eyes blown wide with lust in a manner that flattered him.
You didn’t speak, only gulping and squeezing your thighs together in anticipation. Optimus Prime crawled over you on top of your mattress with his knees on either side of your hips to cage you underneath him. The slit of his spike was already wet with prefluid and lubricant, and he wanted to fuck you so bad, but he knew he had to wait until you were ready.
As embarrassing as it was to admit, before you’d probably even thought of him in such a way, he’d done his own research on human mating rituals to prepare himself for you; enough research to know that human women needed thorough foreplay and preparation to take a human’s spike, let alone a Cybertronian’s, which was usually larger. Due to that, he was always very careful with you, giving you plenty of time and prep before you ever had sex.
So, as he balanced himself on his knees and pinned your wrists above your head with one servo, he circled two of the digits on his free servo with his glossa to lubricate them and get them ready for you. You spread your shaky legs and moved your hips up, almost as if to tell him to get on with it. Your impatience was evident in the way your body moved, your breaths heavy and a pout of frustration taking over your face.
Unable to help himself, Optimus chuckled at the feeling of you trying to move your hands out of his grip to no avail. It was nice to know that despite what had happened earlier, nothing bad had happened to your usual dynamic- and the sound of you bashfully giggling in return made his spark swell with the love he had for you.
Having had enough with making you wait, the Prime prodded his pointer digit at your entrance and slowly pushed it in. He followed with his middle digit and waited for you to adjust, the both of you letting out a sigh. You were so different than any Cybertronian he’d ever done anything with; piping hot, wet, velvety, and sensitive, he couldn’t help how his spike throbbed at the feeling of you moving your hips to fuck yourself on his fingers as you hummed. With him holding your wrists, you couldn’t move your arms down, but you managed to grip one of the digits that was assisting in holding you down.
You’d adjusted quickly enough to his fingers, so Optimus began a steady rhythm of pulling them most of the way out before pushing them back in, over and over and over again, getting progressively faster with each push. You rewarded him with your sweet moans in return and tilted your head back with your mouth agape in the depths of your pleasure.
“You’re so beautiful when you’re like this,” Prime praised you without hesitation and dipped in until he was knuckle deep. That made you say his name especially loud, so he continued doing it, wanting to hear that sound again. “So gorgeous with your face red and eyes half-lidded. I love how you always squeeze one of my fingers during it because your hands are too tiny to fully hold mine; you’re so small I fear breaking you sometimes, but the fact that you still trust me when I’m big enough to crush you like this makes me feel so good.”
“I think your eyes are beautiful,” Surprisingly enough, you praised him back, looking him straight in the optics. “I love it when you look at me when we do it; the face you make is what sends me over the edge, and the noises you make in my ear drive me wild. The way you have so much physical power over me just makes it even more exciting than it already is. It’s like you could do whatever you want to me, any time you want, and I’d let you.”
Your words were rushed but confident, though as soon as you finished, you hid your face in the pillow your head was currently on to stifle a moan at a particularly rough crook of his fingers.
“Ah, you’re embarrassing me now,” The Autobot murmured, able to feel his normally cool-colored faceplates drowning in a heavy pink blush. You seemed ready enough and he was growing just as impatient as you had been earlier, so Optimus slowly withdrew and positioned himself between your legs with the head of his spike at your entrance. He bit his lower lip and rubbed his tip against your slick folds before teasing your clit, which made you emit a cracked moan. “You’re ready, yes?” You gave a hurried nod and moved to rest your cheek on the cold pillow. “I need to hear it, baby. Use your words.”
“I’m ready, please-” Optimus didn’t wait any longer after that, wanton and revved up, the Autobot sheathed his spike in you in one deep stroke and reveled in the debauched cry of yours that followed. Your pussy enveloped him completely, taut and scorching and slick, so much so that his hips stuttered with the willpower it took him to let you adjust instead of fucking you raw like an animal the way he wanted to.
“(y/n), my dearest love,” Optimus groaned and pulled back about half away, then pushed back in, only for your heat to pulse and twitch around him. You moved your hips up to meet his and grinded them in a circular motion in what must’ve been an attempt to urge him to get on with it. “Oh, Primus, if you know what’s good for you, you’re going to stop that. Tonight is not the night to test my patience, because you feel absolutely delectable right now and it’s taking everything in me not to fuck you so hard that you won’t be able to walk or sit down without feeling my spike in you for weeks.”
“Yeah?” You taunted, voice breathy as you dared to test him by wiggling your hips even more and purposefully clenching down around him. The thread that was the last of his patience snapped at that, so he gripped your wrists even tighter in his servo and used the other to balance himself over you so he wouldn’t crush your body. You only continued your teasing.
“Yeah,” Optimus finally responded to you, his lips pulling into a tight smile to keep himself from making any noises that were too embarrassing. When he regained his composure, he leaned down to whisper in your ear. “This is going to get a bit rougher than usual, so don’t say I didn’t try to warn you earlier. You earned this.”
With that, the red and blue bot withdrew until it was just his tip inside you, and then thrusted all the way back in- so hard and deep that he could feel the back of your inner walls. You cried out to him again, your legs trembling as you clenched them together around his hips. Optimus could only smirk- for as teasing and impatient as you’d been earlier, your cocky demeanor was certainly washing away with every rough thrust of his spike, replaced with desperation and heat.
“Optimus,” Your back arched off the bed as you were split open by his spike, but as much as you tried to move, all you could do was lay there and take it with your arms pinned by Optimus’s servo and your lower body trapped in place by his legs between yours and his spike deep inside of you. “Optimus!”
You looked at him, (e/c) eyes clouded over and rosy lips parted in heavy moans and pants that drove him wild. Just to see how you would look, Optimus pushed his hips into yours particularly hard, feeling his spike twitch at the sight of your eyes rolling back and your lips trembling at the sensation of your upcoming orgasm.
“Say my name, darling,” Optimus leaned forward and nipped at your shoulder as he adjusted his angle so he could slam the head of his blunt, thick spike into your sweet spot and pick up his pace. Your eyes went wide before you squeezed them shut again and yelled out at the sudden change, a sliver of drool falling from in between your lips. “I want to be all you remember for the rest of the night, so say all of it...!”
“Optimus,” You practically sobbed as the Autobot made love to you like there was no tomorrow in store. The sounds of his metal hips slamming against you and your broken moans echoed in the room and drove him closer and closer to the edge. He was already inside you, but he found that he still wanted to be closer, so he found himself making out with you yet again. “Optimus Prime,” His name fell from your tongue and onto his lips in between your passionate kisses with every thrust of his spike into your wet heat in a way that made him shudder. The arm that was holding him over you shook with the strength of his upcoming overload, the hand that was holding your wrists above your head on your pillows squeezing just tight enough to leave red marks on your skin in the shape of his large digits.
“That’s it, sweetspark, overload for me, won’t you? I can hear you’re getting close, so why don’t you be a good girl and finish for me? You look so beautiful like this, can’t wait to see you cum around my spike, princess,” Optimus egged you on as he felt your pussy flutter around his spike, quickly bringing him closer and closer to his own climax. Thrusting into your soft, small body was so addicting that he didn’t want it to end, but when you gave a broken moan of his name and tensed so hard that he was sure your fingers digging into his fingers left dents in the metal, he couldn’t help it. You came hard around him, squeezing down to keep his spike deep inside of you in a way that triggered his overload. Optimus Prime gave a soft groan when he finally finished, the electricity in his abdomen and spike exploding and making his entire body go numb as he spilled into you. “Fuck, (y/n)-” Optimus slammed his lips into yours one more time, filling you up with his transfluid and giving you a few more weak thrusts. You kissed back, albeit sloppily due to your current blissed out state. Your tongue lazily intermingled with his. The grip on his shoulders loosened, and you pulled away when you felt him depressurize so he could pull out, close his interace panel, and sit next to where you laid on the side of the bed.
When the afterglow faded and you laid down with your back facing him, Optimus usually laid next to you the best he could considering his size and wrapped an arm around you. However, as he remained sitting up, staring at your back and the (h/c) locks that were splayed out upon your pillow, he found tears of lubricant welling up in his eyes- it had never happened to him before, and though he knew Cybertronians were fully capable of it, crying was primarily an organic behavior. The warm light of the candles in your room bringing out the hues of your (s/c) skin and the scent of your shampoo and soap flooding into his olfactory sensors seemed to bring out all of the emotions at once; fear, relief, love, regret, guilt, and everything else that came with loving you. And, as much as he tried to conceal it, the way his voice cracked when he tried to clear his throat gave it away.
“Optimus? What’s wrong?” You asked, clearly panicked as you turned to face him.
“Nothing, I just-” Optimus stopped and took a deep breath. He didn’t want to cry in front of you, but he figured it was part of learning to be vulnerable, and he was done hiding himself from you. “I love you a lot.”
“I love you, too.”
“Don’t leave me,” Optimus pleaded, letting his guard down for the first time in a long time as he moved to sit on his knees on the floor. You sat on the edge of the bed with your feet planted on the floor, just close enough for him to be able to move between your legs and rest his head on one of your thighs. “Don’t ever leave me, (y/n). I’m so scared I’ll mess this up somehow. What if I hurt you? What if there comes a day that you can’t stand to look at me anymore?”
“You just have to trust yourself,” You murmured.
“I don’t yet,” The Prime admitted as he sat up again and leaned forward to rest his forehead against the middle of your chest. “But I’ll try to learn how to... For you, (y/n).”
“Do it for you, too, Optimus. You deserve to have a good relationship with yourself.”
You looked down at him, the smile on your face laced with your concern and exhaustion. You softly ran a hand over the top of his head in a clear attempt at comforting him. Though Optimus was hopeful for what was to come despite his earlier worries, he felt guilty that you had to deal with him like this; anxious and soft and unsure of himself.
The Autobot let out a gentle sigh and pressed a kiss against your collarbone. You smelled like vanilla, jasmine, and something uniquely you; all mixed with his own scent, evidence of the entanglement of your two bodies that would remain until you showered in the morning. Your arms still lingered around his neck as you stared down at him.
It was peaceful, and the second you leaned down to peck his forehead with your kiss-bruised lips, Optimus decided that he’d try his hardest to make it work; for you.