Stiles knows he's smaller than Derek.
… okay, he's also smaller than Isaac.
And damn it he's smaller than Scott too.
But seriously, it's not his fault. He just hasn't finished growing. And there must be something in that stupid werewolf thing that turns someone from scrawny to brawny.
He shouldn't be called 'small' just for hanging out with people who are bigger than him for a perfectly logical, supernatural reason. He's not small. He's…. able to get into more spaces than the other boys.
Anyway, just because he might be a few inches shorter and does not have hulking muscles does not mean that Derek has the right to PICK HIM UP while kissing him.
The first time it happened, he yelped into Derek's mouth when he was picked up like a little kid. The feeling of being held close and protected was… strange to say the least. And not unwelcome.
But he protested and kicked and pounded his fist on Derek's back because the feeling of his feet dangling was unnerving and he was not small, damn it!
And stubborn Sourwolf being said stubborn Sourwolf, Derek refused to put him down.
So he grew accustomed to the feeling. Of his feet suddenly leaving the ground, strong arms wrapping around him and big hands slipping into his back pockets and sometimes he even helps, wrapping his legs around his boyfriend's waist in order to give the illusion that he was helping even though Derek certainly didn't need help holding him up.
And it's nice. It's nice and warm and comfortable and he finds it so much better than being pushed up against a wall and kissed roughly. Not that being pushed against a wall's BAD in anyway… being held gently just doesn't result in bruises and a boyfriend whose tail is literally in between his legs.
He's not small. He just happens to have a hunky, hulking boyfriend whose arms are very comfortable. And who makes him feel save and loved and warm and protected. He's not small, he swears.