"stiles, where are you going? […] let’s just go back to sleep. […] don’t worry about it. […] just go back to sleep stiles. what if who gets in? stiles, just leave it please… come back to bed! stiles, please! don’t stiles! don’t! don’t go in there, please, stiles!"
We have this headcanon about them not being one of these super touchy-feely couples. They’re more into little details and little gestures. And if you want to catch these moments you have to pay attention.