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1:
The first time Saiko and Kusuo had touched, as in not just brushing up against him, was around 3 and half months after they met. Now, by then they were both simultaneously crushing and denying that they had a crush on each other. So, it was an ordinary day, and Kusuo and the annoyances(TM) were all sitting at the lunch tables together. Now, previously Kusuo had stayed up the whole night playing a new video game before any spoilers came out. This might have been fine, and Kusuo would have been able to get through the day, if not for the fact that he had not slept the week prior either, due to Kusuke being home, and the worries that when he fell asleep he would be subjected to experiments as per usual when Kusuke visited.
So, when someone has been up for 8 days straight without drinking 17 espresso shots, they fall asleep. And what had Kusuo not done? Drink 17 espresso shots. It is also a fun tip that humans when tired tend to gravitate to the people they trust most, and Saiko, sitting next to him and having brought Kusuo coffee jelly before was the obvious answer. So unpredictably, Kusuo after a few minutes of struggling to stay awake, passed out, right. On. Saiko's. Shoulder.
Saiko, having had a crush on this pretty sleepy boy currently on him, immediately blushed profusely and froze up. He then continued to stay still until the lunch bell rang waking Kusuo up, who noticed his position, and sprung up and got the FUCK out of that situation while blushing even more than Saiko.
2:
The next time something like before happened, it was again Kusuo who instigated the contact. A well known fact about Kusuo in the fandom is that he is deathly afraid of bugs, as like Nendo, their brains are just too small to read, making them unpredictable and therefore, dangerous. But, this fact is not know to Kusuo's annoyances. So, when Nendo unknowingly brought a cockroach into the classroom, Kusuo immediately jumped behind Saiko to hide from it.
"Aw Saiki, come on, it's just a friendly little bug! It won't hurt you!" Nendo teased, bring it FUCKING CLOSER. Kusuo felt himself tense up and latched onto Saiko even harder, wile said person was wonder why his future husband was 1: hiding in him and 2: how the fuck he was so strong because he was pretty sure not even his bodyguards would be able to pull him off (not that he would want that Kusuo was TOUCHING HIM OH GOD THIS IS THE BEST DAY EVER). Nonetheless, it was his duty to protect his future boyfriend.
"Pleb, go put that this back where you found it, it's disgusting and no one but you could EVER like such a thing." Saiko stated, trying to save face while internally melting at how cute Saiki was right now. Of coirse, Nendo did NOT listen to him, instead opting to try and shove the thing into Kusuo's face, whose immediate reaction was to burrow his face into Saiko's shoulder and let out an involuntary whimper. And that was it for Saiko, who turned around, picked Kusuo up bridal style, and promptly walked out of the classroom to calm down Kusuo. Meanwhile, Shun was chastising Nendo, and the girls were consoling Kokomi because there was no way she would get a shot at Kusuo after that gay an encounter.
3:
The third time Kusuo initiated contact was when he saw Saiko getting mugged, and being the tsundere he is, sprinted over at an inhuman speed and immediately began beating the goddamn shit out of them, while they tried to defend themselves. Unfortunately for them, them only had guns and a pocket knife, unable to shoot him, but luckily the knife stabbed him. In hindsight perhaps it was unlucky for them, as it only fueled Kusuo's rage, who then BIT THE GUY WHO STABBED HIM. Saiko watching his future boyfriend (yes he finally accepted he's down bad for Kusuo) go feral beating these fuckers up, realized that not only id Kusuo boyfriend material, but is scary dog boyfriend material, meaning that Saiko cna finally be a princess, which fuck yeah he wants to be the princess in the relationship, that's just another reason that he HAS to try and woo Kusuo. (Haha Kusuo also has a crush on Saiko lmaooo imagine these useless gays... yeah imagine... *coughcough*i'm also queer and useless*coughcough*)
Now, Kusuo is still beating the shit out of those guys... nope he's done. Kusuo stands up and offers his hand out to Saiko who takes it graciously. "Hey." Kusuo says before asking, "Would you like to go to cafe Mimi with me?" While Kusuo would normally just pay attention and wait to telepathically hear Saiko's response, his mind is currently racing with gay ass thoughts about him and Saiko happily living the rest of their life together like a lovesick schoolgirl.
"Why yes, I would love to." Saiko responds, and with that, they walk towards the cafe without either of them realizing, or maybe they did, and they didn't care, that they were still holding hands.
+1:
Saiko was ready. Today was the day that he was going to ask Kusuo on a date. Nothing fancy, just a nice picnic in the park with lunch and desserts. Go he was nervous. Ack here he comes!
"Ahem.. Saiki." Saiko asked, looking into his eyes, "I was wondering..... if you would like to go in a date? With me? On Saturday on a picnic in the central park at 12?" Saiko shut his eyes and looked down while he was waiting for a response, nervous for one of the first times of being rejected. "Saiko... really?" Saiko looked up at Kusuo's blushing face, finding it incredibly cute. "Well, I mean if you would like to? I've liked you for a while now and this seemed like good time to ask you..." He trailed off, his hopes slowly being crushed until, well something crashed into him.
Saiki dove into him, pulling him into a kiss as he blushed profusely. "You liked me? I thought it was one-sided and then you ask me on a date?!?!" His voice going squeaky at the end. "Of course I want to go on a date with you! Now come on, as your new boyfriend, I'm walking you to class. Let's go now, and if we aren't late I shall give more kisses." And with that, they walked to class, both of their cheeks a dull pink, still blushing from the fact that they didn't have to pine over their crush anymore.