Serina, a new graduate and gym trainer, gets more than she bargained for when Kensuke shows up at the gym. He's got a thing for her, and he's not shy about it. He corners her, his massive cock straining against his shorts. She's hesitant at first, but he's persuasive, and soon she's riding him cowgirl style, her body glistening with sweat as she grinds against him. He fucks her hard, her natural tits bouncing as she cums over and over again, until he can't hold back any longer and cums inside her, filling her up.