During paired stretches and strength training with Rukawa, the adult women's track ace, her scent, soft breasts, and visible camel toe make me hard. She rubs my cockhead against her slit through her bloomers and teases it one centimeter inside while pretending to train normally. Unable to take any more, I finally penetrate her fully. After all that teasing, she rides my nearly bursting cock with her big ass and makes me cum so hard that, despite already having a girlfriend, I become obsessed with her.