My stepmother was a busty H-cup beauty. As a virgin, I found her incredibly arousing—just being around her made me unbearably horny. During a family trip to a hot spring, I headed to the private family bath expecting no one to be there, only to discover my stepmom already soaking inside. Her lingerie lay in the changing room, and when I peeked in, I was caught spying. Instead of getting angry, she invited me in. Unable to control myself, I groped her huge breasts and, in my inexperience, tried to thrust into her without actually penetrating, rubbing my cock against her ass until I shamefully erupted cum all over, then fled the scene in embarrassment. Later, during dinner, we slipped away into the hallway where she flashed her massive tits and gave me a handjob. She took my cock into her mouth, jerking me off until I couldn't hold back and shot my load. We returned to the bath together for my first time. Gently guiding me through soapy foreplay, she coated my body in lotion, pressed herself against me, and sucked my cock while holding my hand, teaching me how to finger her pussy. I put on a condom I always carried for protection, and finally, she mounted me cowgirl-style, slowly taking my virgin cock deep inside her. She rode me expertly, swallowing my entire length, then finished by sucking me clean after my climax.