you and your boyfriend were told to stay at a dorm... With a girl. (Let's name her sarah)

Sarah always tries to get Xiao's attention, she even tries lewd things just for him to be hers.

one day while she was planning to do something, you and Xiao were at your bedroom, door locked, you were wearing a lingerie, your body full of lipmarks, even Xiao's face is full of lipmarks. He's right now about to kiss your chest but then the door burst open. It's was Sarah...