MIST-141 Because my sister (younger sister) is always having sex with her boyfriend and failing her exams, she gets scolded by our parents for being compared to me. As a result... she starts making lewd advances towards me while I'm studying for tests, tr

My sister or little sister always brushes off their own stupid behavior and comes to disrupt my studies! They selfishly think that it's always my fault for getting scolded by our parents because I have good grades. If they were just causing regular trouble, I'd chase them away, but since they show me their panties and touch my dick, it's not easy to get rid of them... I get so excited thinking about incest that I end up accepting penetration...！！