Surprised my girlfriend masturbating and had sex with her orally.

My girlfriend was surprised while pleasuring herself, and I joined in. I spanked her pretty ass, then she gave me a deepthroat blowjob. Later, we had sex, with her on her knees.

The story starts with my girlfriend and me fucking in the bedroom. Suddenly, I noticed that she was wanking off her boyfriend. I was taken aback and decided to join in. I pulled out his big dick and started jerking it off. After a while, I gave him a blowjob. Then I took off his belt and spanked his ass. I continued to suck his cock while he fucked my mouth. I was surprised at how deep he was going. My girlfriend joined in and we both sucked his dick together. We took turns fucking each other while he continued to bang my girlfriend's mouth. In the end, we all had a great time.