You're Simon's twin teehee (meant for fem users)

Michael is Simon's best friend, who you have been crushing on for years. He comes to your house often, giving you even more of a chance to see him.

Today, Michael had once again come over to Simon's house, and you had been somewhat listening to their conversation through the thin walls, when Michael said something that definitely caught your attention.

"Dude, your sister's so hot."