Secret twins trope, I HATE YOU!!!

I hateeee this trope so much, it's so annoying, first it's incestuous idc if the twins technically don't have feelings for each other they still having threesomes and in a relationship with the same guy. Second it's always rape, one of the twins pretending to be the other for sex THATS RAPE FFS, third it's really fucking weird to randomly make up a twin in the middle of a story AND MY FAV STORY AT THE MOMENT SEEMS TO BE DOING THIS "PLAYMATE" IS DISAPPOINTING ME GREATLY IM SO FUCKING SAD ABOUT THIS