On a recreational trip with my friend's family, I stayed overnight at a hot spring inn. Shy and uncomfortable bathing with others, I secretly headed to the outdoor bath. However, I froze when I noticed my friend's mother was already soaking there. Suddenly, she said, "Let me wash your body," and I couldn't refuse. As she scrubbed my back, her big tits pressed against me, making me hard instantly. She gently took my cock in her hand and gave me a handjob, heightening my arousal. "You've never kissed anyone? Let's try it—just don't tell anyone," she whispered. Then she French kissed me, sending my excitement soaring. She groped my cock while I fondled her big tits, and then asked, "Want to see my pussy?" Lifting one leg, she exposed herself right there. We kept kissing deeply while she jerked me off, taught me how to finger her, and then gave me a wet blowjob and titty fuck, making loud squelching sounds. Underwater, we fucked in missionary, face-to-face doggy, and rear entry positions. Overwhelmed by the tightness of her married pussy, I couldn't hold back and erupted inside her with a creampie.