On Saturday, I woke up to find my senior colleague, Karen, next to me...! Huh, did we do it yesterday? Karen was sleeping soundly beside me, wearing sporty underwear that showed off her cleavage and the lines of her butt, with her pussy exposed. I hadn't noticed last night, but she was wearing that kind of underwear. Ahh, so erotic. I couldn't control myself and got a morning erection. Once or twice doesn't make a difference, right...? "What are you doing, ahh!" The combination of her beautiful curves and underwear made me feel like I was going to ejaculate, so I inserted it raw. I thrust into her pussy as soon as she woke up, once, twice, three times... I couldn't hold back and came inside her. "Ahh, no, I'm going to come!!" Even though she has a boyfriend, Karen came so hard from my dick that I got even more excited. I completely forgot about my plans and fucked her like crazy all day long! Her sexy appearance was different from usual, and I ejaculated 12 times until I was completely drained! I came inside her again and again with my unstoppable, runaway piston thrusts...