Ya, tbh this is pretty creepy. I mean, if you switch this shit around and instead of an older sister (age wise she's basically his aunt) and it's an uncle (Big-Brother that's 11 years older) and a dad in a tiny bathtub with a ten-year-old little girl sandwiched between two dicks it would be fuc$ed up. But since it's a boy with a milf and a wilf it's hawt
This would be awesome if the dude was at least in freshmen year of high school, or if it was at least just purely platonic and there were no mixed emotions in it.