First time it was an accident, of course it was. Derek was always in control of himself, he just failed at that moment, and fell trapping Stiles beneath him, but the fact was that he just leaned and let his lips touch the boy's instead of getting up.
As soon as he realized what he was doing, he stood up and straightened himself, looking at the boy who was still laid on the floor - smiling.
"So," he began, teasing for sure. But Derek couldn't listen someone - that someone - teasing him, and just let it be.
So he got the boy from the floor himself, in a sudden movement. And in just few more movements, pushed the boy against the wall. "One word of it, and you're dead." he threatened, but no effect it had in the boy anymore, who just bend himself forward and pressed his lips against the werewolf's one.
And yes, Derek was under Stiles' power since then.
They kept it secret, and Derek was every night climbing the window to Stiles room.
But the feelings and the responsibility were starting to bite on Derek.
He felt so wrong in hiding it from everyone. He was okay with all this. He could just tell everyone they were dating already.
"I'm tired of hiding," he began telling Stiles, stopping mid-kiss. He was for sure referring to earlier this same day when Scott asked about his smell all over Stiles place, and all over Stiles himself. He went to the Hale's place to ask what was the problem, if he has been threatening his best friend just like every day. And Derek knew he was not going tolerate hiding anything anymore, because it was not a now and then thing anymore, it was becoming a daily basis in the last two weeks, and he just faced himself admitting he was feeling something for the boy, something meaningful.
"Tell Scott we are dating," he said that with confidence, like that was just what the boy was waiting to hear. But his face was confused and Derek felt like that wasn't enough and said "I can face your father, if you want to..."
"We're not dating!" Stiles snapped him. And was staring at him. He pushed the boy a bit farther so he could look at him.
"What?" he said without thinking, he was not expecting that.
"We're not dating, like you are my boyfriend," he said, fast, as if Derek was supposed to know that, "and I'm yours."
Derek thanked he was good in hiding emotions, because he felt and empty hole inside him with that words. "We are not dating, what the fuck are we doing then?!" he said, calm and a bit angry, because that's just how he is.
"We are just making out." Stiles said, pulling himself closer to Derek as if nothing has changed between them. And whispering closer to Derek, just not to shut up, he said "for earning experience... and you for, whatever it is... Not losing the practice?" he said rhetorically, laughing at the situation and he was okay with it.
Derek step back again, and Stiles widened his eyes. "What?" he said mostly to himself, putting the thoughts in order and then he said, "Is that because we didn't ask each other formally or something like that?" he was not waiting for an answer and was not looking at Stiles. "Okay then," and with a pause he went back to look at Stiles "Do you want to be my boyfriend?" he was truly, well this was a huge step considering who he is.
"No" Stiles chuckled as it was nothing but a kidding
Derek frowned confused now. "I'm serious Stiles!"
"No!" he was angry now, "I like making out with you, and you are like" and gesticulated over Derek head to foot, "hot like hell, but you are like 6 years older and my father will just freak out, my best friend kinda hates you and I love Lydia." it all hurt, but the last part was the worst.
"You love Lydia?" how could he love someone that didn't give a shit about him, while there was someone willingly to face his father - the sheriff.
"Yeah," Stiles was serious now, just like Derek. "And I always will..." he was telling himself that. "It's okay, alright, I don't care if you want someone else too, we're like...mean nothing."
And Derek was really angry now, how could the boy not see his feelings for him. "I don't want anyone else... Do you think I would be here all this time if it meant nothing?" Derek couldn't hold himself anymore, the words were just going out.
"Oh my God! I see," Stiles began "look, let's just keep as we are and it's fine." he was approaching Derek again.
"No, it's not!" Derek let a bit of hurt leak through his words. "I don't want it to be this way." and walked towards the window, and shooting one last glance at Stiles, he left.
And Stiles was alone, just to think of what did just happen. Derek Hale, Derek fucking Hale, the hot, gorgeous, bad werewolf, had just declared to have feelings - yes, Derek has feelings - for him. What means he got the last weeks all wrong, he was not like just fun for the older guy, but he didn't consider the possibility of actually dating Derek. How was he supposed to tell his father, or Scott? and that could screw all his minimum chances with Lydia.