I was grounded by my girlfriend and I had an insatiable sex drive. So, I often didn't even look at the face of whoever it was, and just thrust my erect penis into the exposed butt that was sticking out defenselessly, and pistoned away hard, ejaculating inside the vagina. Ahh, it felt so good, but then I realized I had penetrated my girlfriend's sister's pussy, and now I'm absolutely screwed! Or so I thought, but it seemed like I had lit a fire…
