One day on a business trip, I was caught in a downpour and unexpectedly ended up sharing a room with Sayama, a plain, introverted girl I'd never even spoken to before... The conversation didn't flow and an awkward atmosphere prevailed. However, when she took off her jacket, I caught sight of her voluptuous, wet breasts, and her body looked so comfortable to hug, so I couldn't resist and ended up pushing her down on the bed! If it was just once... she was quiet, so I wouldn't have to worry about her telling on me. But this one thrust awakened Sayama's pent-up sexual desire! "I'm so happy you've got a rock hard as a rock with me like this..." She straddled me with an aggressiveness I'd never imagined, and used her nasty hidden techniques for both titjobs and blowjobs, making me cum all night long...