HUNTC-475 "If you keep masturbating all the time you'll become stupid, so let's have sex, sister-in-law!" My sister-in-law suggested sex because she was worried about me, who was always masturbating instead of studying! But in reality, she was just horny and wanted to have sex herself.

I'm single... I'm not popular with women, so my daily routine is masturbation. And since my sex drive is strong, I do it almost every day. My sister-in-law secretly watched me! Then one day she lectured me, "You'll become stupid if you keep masturbating all the time!" She then suggested a solution to my masturbation addiction: "Let's have sex." What?! Really? While I was still confused, she gave me a blowjob! And then, with my sister-in-law leading the way, things progressed...