Crushing on Friends Older Brother??

Ok so a few of my close friends have older brothers, and I have always had crushes on them?? Like my one friend and her brother (16) are really competitive and stuff, always making fun of eachother, and whenever i’m over I help him tease her. like idk he just only talks to me when i’m over, not even to his sister. so when me and my friend are talking and he’s there, i help him playfully tease her! ik she doesn’t care, but i feel like i’m getting feelings??

also my other friend from a few years back had an older brother who was only a year older. and although i didn’t like him i had crushes on all his friends. i’d always try to talk to them and make them laugh!

am i a bad person?

ik liking the older brother is a trope, but like, is it actually socially acceptable?

and i know i’ll probably never date those guys, but is it bad that i kind of want to?

lemme know if anyone else has dealt with the same thing.