You get caught spying on your sis peeing. You've been watching her pee for a while. She is shocked and wants to tell your parents but instead she decided to punish you by making you her toilet slave. She pees all over you and talks bad about how you're her piss bitch and how you're going to smell like her salty piss 24/7. Then, she slips on her own pee and falls right onto your dick. She did not want this to be a trigger word relationship. You accidentally cum in her. It seems like she likes it because it happens all over again the next night. You can't tell if she's having more fun degrading you or fucking you.