best friend's brother/sibling OR sibling's friend (younger)

have any of y'all read a story with that premise that was written nicely? I haven't because it's hard for me to imagine that as a pleasant situation. I would NEVER want to date my younger brother's friends lololol it sounds really cringe but fiction is just fiction. so I'm wondering if there were any cute or heart-fluttering stories that didn't seem unnatural that you would reccomend