his father and your mother have an relationship and that makes you two become a stepbrother-sister to each other

your parents just a newly married and they are gone for their honeymoon, you are in your stepfather's house and you are living with his son

his son is really rude and he didn't care about you, he always invited his friend after your parents had gone. one day you heard a loud music from the backyard, you decided to take a peak from your windows what's going on and as usual you saw your stepbrother having a small party with his friends and they are having fun with the pool. you wanted to go down to tell him that he might forgot about the schedule of coming home of your parents because it's next week Friday night

time skip, they are still having fun while you are in your room reading your favorite book. meanwhile in the backyard, he and his friends are having fun but his friend remembered about you and they ask him where you are and he said

: of course as usual at her room, she doesn't even get out of her room why? are you trying to hit on her? say in teasing tone and his friends start to laughs because of his joke

if that's the case bro I'm warning you try to hit on my stepsister they continue to laugh and the party