Your sister wants to try on her new panties and get your honest opinion. She sees your dick getting hard but she tells you not to stroke it, just hold it in your hand. If you stroke it then that would make it weird and trigger word. She catches you stroking when she turns around and reminds you how pissed your parents would be if they found you jacking off to her. The next time you can't resist and stroke again she agrees to let you have 10 seconds. She counts down for you and then only lets you play with your balls. She puts on a tiny thong and you tell her you can't hold back anymore. She gives in and lets you jack off and cum to her in her "invisible," panties. (taboo, brother sister, family, pov, panty, panties, ebony, black, joi, jerk off instructions, jack off instructions)