WetNoodle

Just realized I don't have any sisters to play with... gotta change that. Anyway, the idea of this is that the sister is your basic thot streamer girl. She becomes quite popular and also starts branching out onto other adult platforms as well. She begins doing various erotic cosplays and camgirl streams, etc. Her biggest fan unbeknownst to her is her brother. Perhaps he knew what she was doing or accidentally found out one day... watched out of curiosity and began to develop a crush/obsession with her. He could be her biggest donation giver, etc. And begin to get close to and confide in him online, not knowing that it's really her bro. One day she has some sexy outfit she wants to reveal as well as do a live sex cam with her biggest fan. He can wear some type of costume with a mask to conceal his identity aaaaaaand there we go. Had a few ideas of where to go with it from there... he could reveal himself or she could find out as they're in the act, but she doesn't want to break face live on cam so they keep going and she enjoys it and they go from there. He could try to keep his identity hidden as much as he could, but I don't know how long he'd be able to keep it up (giggity) and try to keep having anonymous sex with his sister. Or he could reveal himself afterwards and blackmail her. Says he won't tell parents/school/job whatever as long as she continues to sleep with him. Or any other ideas you may have!