I'm nervous about my first time with my girlfriend → My worried stepmother says, "Do you want to practice with me? It's okay to fail as many times as you like" → I succeed in having sex with my girlfriend → "Did you have sex properly? Shall we check the answer?" Not only do we practice beforehand, but my stepmother also asks for check-the-answer sex after I succeed in having sex with her. Naturally, I also shake my hips desperately to show her the results of my practice! Then my stepmother becomes addicted to the sex I've trained her in, and cums over and over again with a gentle smile saying, "Well done!" The results of my practice are perfect!