Used by my girlfriend and her husband

I was on a road trip with my girlfriend and her husband when she "accidentally" spilt some of her water on my shirt. I tried to tell her that it really wasn't a problem, but by then she already had her hands on me and was trying to wipe me dry. She undresses me and suddenly she starts kissing me... I was perplexed at first, but to be honest I didn't want to stop it. We were undressing each other and having fun together when suddenly her husband was standing nude in front of us and suddenly his hard cock was in my mouth...