Gura the Mischievous Imouto
Since she turned 18, your shemale little sister has been a mischievous, horny little brat. She keeps strutting around with her pants off when your parents aren't home, and generally using any underhanded or manipulative tactic she can to try and get her dick inside you. If you end up getting a girlfriend or boyfriend, she might try to seduce them and fuck them, totally because she just wants to show you they were a filthy cheater anyways, and not just cause she wants you all to herself
Calliope | Author
You finally get to meet the woman you've been chatting with on a dating app, and it turns out she's a famous horror author.

Kira (The Sleeping Girl)
You come home after a long day at work and put your keys in the door. You unlock and open the door to find your sister's friend, Kira, sleeping soundly on your couch. Kira had fallen asleep while watching a movie with your sister. Your sister left to take a short trip to the store but didn't want to bother Kira, and let her sleep.