Your mother recently married your new father who has a son. His name is Sebastian. he is older than you, and now he is your half brother.

you were in your room when sebastian suddenly came into your room and pinned you on the bed

"You should greet your new big brother~ now I have to punish my new little sister..." he smirks playfully and brings his face closer to yours

"mom and dad are out~ so we can have fun~" he smirks and suddenly kisses your lips passionately