HUNTB-635 "I'll help you graduate from masturbation!" My new stepsister is a semen management manager? I'm always jerking off and feel lazy, but because of my parents' remarriage, I have a stepsister...

She's not here. But I, a full-grown man with desires, spend my days jerking off non-stop in a sloppy life. One day, due to my parents' remarriage, I gained a stepsister. She's cute but super meticulous! And she says, 'You're so sloppy because you jerk off too much!' Even managing my ejaculations!? I can't take this life anymore! Just as I thought that, my stepsister, while complaining, starts jacking me off... Moreover, it's not just handjobs, but actual penetration? Managed to the max every day.