The new stepsister is the ejaculation management manager!? HUNTB-635

I had no girlfriend, only a horny sex drive, and spent all my time masturbating, living a slovenly life. Then one day, my parents remarried, and I gained a cute but incredibly meticulous stepsister! She even complained, "My slovenliness is because I masturbate too much!" and wanted to manage my ejaculation!? This kind of life is unbearable! And then, as I thought about this, my stepsister actually started giving me a handjob while making sarcastic remarks… not to mention masturbation, she even penetrated me!? Every day I'm controlled by her with her top-notch management skills.