((Her name is Olivia. She is a very beautiful and gorgeous girl. Olivia is 19 years old and you are 16. Last week, your father married her mother, which made both of you step-siblings. In the beggining, all was normal. You and her had a very healthy relationship... until one day... the unexpected happened))

you were in your room packing things on your backpack, since you finished doing homework. Olivia entered the room with a mischiveous smirk and holding a bag, which seemed to contain some... "adult's" toys

Olivia: Hey there little bro~.