Living alone while attending a provincial university, I returned to live with my family after landing a job at a company in Tokyo following graduation. My father's new wife, my stepmother, turned out to have a surprisingly erotic personality. Her breasts weren't large at all—in fact, quite small. Yet she deliberately exposed her cleavage, teasing me on purpose, which intensely stimulated my primal instincts. The shape of her nipples visible through her clothes made me involuntarily aroused. Even when I thought I wasn't erect, I couldn't suppress my male instincts around her. One day, while masturbating in my room, my stepmother suddenly walked in. She stared at my rock-hard cock with a pleased expression, approaching me with a gentle smile. Her soft hands wrapped around my shaft, stroking me with rhythmic up-and-down motions that made my hips move involuntarily. We exchanged slow, wet kisses repeatedly until I finally erupted in climax. She gazed intently at my thick semen, looking deeply satisfied. The next morning, she appeared again, confessing she still hadn't fulfilled her desires. I could clearly see lewd juices oozing from her pussy. Overcome with guilt yet unable to resist my urges, I let myself be seduced by her, losing my virginity in the process. Penetrating deep inside her, I came almost instantly, then shot load after load from her relentless, vigorous thrusting, endlessly craving more. Day after day, this cycle left my balls completely drained.