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“Donatello!”
Donnie fought back a smile. He could recognize that voice from miles away, technically impossible as it may seem.
As much as he hated intrusions into his lab, Yuichi Usagi was more welcome than most, id est his annoying brothers. Probably the only person above him in “ability to barge into the lab unannounced without Donnie trying to set said person on fire” was April.
Usagi spun Donnie’s chair around, forcing the turtle to face him. The distance between their faces was small, too small but also somehow not small enough.
“Whatcha workin’ on?” Usagi asked innocently.
Ignoring his beating heart, Donnie said, “Again, ‘boyfriend privileges’ only work on invasions of Leo’s personal space, not mine.” He proceeded to flick Usagi between his eyes.
The samurai was unaffected, however. He donned a wicked grin. “Are you kicking me out, kappa?”
Yes, he should’ve said, but both he and Usagi knew damn well he would never. “You’re one of the only people who doesn’t immediately destroy my experiments the second you set foot in my lab,” Donnie said instead, “why would I kick you out?”
“Aw, how sweet!”
Ugh.
Donnie didn’t really know how to describe it, but there was always a certain… tension between him and Usagi, even before Usagi started dating Leo. It was always little moments like this, where their faces were too close together, or their hands brushed, and Donnie’s heart was sent racing.
It was clear Usagi was also affected, with his jumbled speech and bright cheeks right after, but he also mixed words and blushed stupid around Nardo, of all people, so Donnie figured there wasn’t much to it.
Only recently, because of course eureka strikes late, did Donnie piece together that his racing heart was because he liked Usagi. As in, he romantically liked Usagi.
He hated it. Not only did it totally ruin his bad boy image, but this was his brother’s boyfriend, for science’s sake!
He was content to just shove it down. He was good at that, or so he thought.
Donnie kicked the floor, rolling his chair back a couple of feet — an appropriate distance to be from his brother’s boyfriend — before standing up. “May I ask why you’re not with your dearly beloved?”
Usagi lit up at the mention of Leo. “Oh! He’s distracting Mikey ‘n’ Raph so they don’t use the projector. We’re tryna marathon the first set of Jupiter Jim movies!”
Donnie raised a perfectly-drawn eyebrow. “And you’re in here because…?”
“I’m supposed to suss out what you’re doing and make sure you’ll be distracted long enough so you won’t, quote, ‘Barge in and destroy the mood with your wrong opinions.’”
Donnie almost let out an offended gasp (or rather, let his offense be known by stating, “offended gasp”), but Usagi’s face faltered, causing the words to catch in his throat.
The rabbit mumbled out stiffly, “And I… wanted to see you.”
“Oh.”
Donnie’s face felt ablaze.
They usually danced around the tension, left jumbled words and half-baked excuses hanging between them. But with those six words, so direct and genuine, the atmosphere completely changed. The air felt like electricity, like something might actually happen.
The mere thought had Donnie’s eyes trailing down, locking on Usagi’s lips. Was it always this hard to breathe?
Control yourself, Donatello!
Usagi took a tentative step closer, his own chest rising and falling rapidly.
There was something pulling Donnie in. Maybe it was science, a desire to know more, maybe it was something more abstract like feelings, a desire to keep the metaphorical butterflies around, but he leaned in, closed the distance between them.
Their lips connected.
Immediately, Donnie knew he was making a bad decision. He knew he should stop, shove Usagi away, do something. It shouldn’t have happened at all, but since it did, it should have stopped at a simple peck.
But he kissed back again. And again. And again and again. Donnie wasn’t sure he would enjoy kissing — the messy smattering of lips seemed like a sensory nightmare — but as he cupped Usagi’s face in his hands, he found it quite intoxicating.
Usagi’s arms settled on Donnie’s hips, pulling him closer. Their chests were pressed together, and Donnie knew Usagi could feel his heart racing beneath his plastron. His own hands travelled to Usagi’s jaw, tilting the rabbit’s head for better access.
They melted into each other. Usagi tentatively licked into Donnie’s mouth, and the turtle responded with fervor. It was blissful, exploring each other’s mouths, feeling the electricity race through their veins. Donnie never felt anything like it before, and he had that cliche thought of never wanting it to end.
Too soon (and far, far too late), the two pulled apart — breathless, flushed.
Donnie hazarded another look at Usagi’s lips, slightly swollen. His heart sank to his stomach as what they just did hit him full force.
Those lips did not belong to him. They belonged to Leo.
But fuck, if that wasn’t the best thing Donnie ever experienced. He wanted nothing more than to do more trials, gather more evidence on the experience of making out with the samurai rabbit, but Leo’s voice barrelled closer to the lab.
“I, uh,” Usagi stuttered, obviously dazed. His arms fell to his sides. “I should…”
Donnie stepped away. He wiped his mouth, as if that absolved him of his actions. “Yeah.”
“I’ll see you later, Donatello.”
“Right. Later.”
Usagi’s eyes watered, but he quickly wiped away the tears and threw on a smile, meeting Leo at the lab’s entrance. The rabbit’s voice was as light as ever, if not a bit wobbly.
Donnie wondered if Leo would notice. He was good at things like that — nitpicking details, sniffing people out. Would he notice the disheveled fur on Usagi’s face, his glassy eyes, his swollen lips?
Donnie collapsed into his chair, heart still racing. His hand shook as he lifted it to his lips.
It was so good, and he was the world’s worst brother because of it.
What had he done?