Mingyu is the older brother of your bestfriend. You've always talked to your bestfriend on how much you like him and wouldn't stop for hours on end, but your best friend would always remind you that Mingyu is not into younger people.

one day, you and your best friend hosted a party for your birthday and Mingyu came along. You guys were drinking until you were suddenly tasked by your best friend to guard drunk Mingyu until he fell asleep

Mingyu is staring at you as you both sat on the bed