Aiden didn't really think about how much he liked people. Mostly because he didn't really like people. But there were very few words for the way he liked Stiles.
Headcanons under the cut.
Aiden likes just watching Stiles. There isn't really any sort of reason for it just that he likes the way that Stiles moves
Stiles likes to rope Aiden into detective work
Aiden likes to watch youtubers and Stiles is more into like procedural dramas but they both enjoy those satisfying asmr videos
Aiden really likes snow and they do a road trip to washington to ski. Stiles can't drive the Jeep that far as its not good for cold weather and was pouting until he discovered he was good at skiing
Stiles practices lacrosse with Aiden sometimes but Aiden really couldn't give less of a crap about lacrosse (though he does enjoy watching it, just has no interest in playing it)
They both enjoy being the little spoon so they'll alternate every night
Stiles is a blanket hog and Aiden finds it adorable if not slightly annoying, but to be fair Aiden finds everything about Stiles adorable and slightly annoying
Aiden loves spicy foods and Stiles can't handle them at all
Stiles can cook basic meals and a few things his mother taught him but generally Aiden does more cooking as he's got a full recipe book he shares with Ethan