I got really drunk with my friend and his girlfriend at the time and we all started getting naked and joking around but then it turned into an all out threesome. None of us had a condom on us so my friend just told not to cum inside her and to pull out. I was fucking his wife from behind doggy style while she was sucking him. She has such a big fat juicy ass I was so excited about seeing my cock in his girlfriends pussy especially without a condom on it. He kept telling me to make sure I pull out in time. I did not want to cum and I did not want to take my cock out of her pussy so I keep squeezing the bottom of my shaft with my hand to prolong my cumming. I could feel I was leaking inside her but did not say anything. All of a sudden I could not control myself and started cumming inside her. She could not say anything cause he was ramming his cock down her throat. I acted like nothing was happening but I could see her looking back at me with this really mad look in her eyes and reaching back to feel her pussy from underneath. When I pulled out I could see my cum trickle out of her pussy and she got up and ran into the bathroom before my friend could get his cock in her. She gave me a real dirty look as she walked to the bathroom and told him she had to go to the bathroom. He never caught on about what happen. She gave me hell a few days later when we were alone and said if she was pregnant I would be in a world of shit. She got her period a week later and all was ok. They got married last month and I went to the wedding. It felt so good knowing I unloaded my cock inside her pussy. I felt like I own a piece of her ass. Fucking someone elses woman is cool but cumming inside someone elses women without there permission is such a great feeling.