Today I worked overtime until nearly midnight, finally tomorrow is a day off. Right at that moment, Ito, my colleague, called. It turns out her bathtub was broken, and since our houses are close to each other, she wanted to come over to take a bath. When Ito entered the bathroom, even though I already had a girlfriend and knew this was wrong, I couldn't help but peek at her! But Ito caught me in the act. Not only was she not angry, but she even cheerfully asked me if I was turned on. She also found out that I was still a virgin. And using the excuse of helping me take the lead when making love to my girlfriend, Ito said she would teach me about sex! And so, throughout that night, despite ejaculating numerous times, every time I looked at Ito's body, my penis immediately got hard again...