Not long after we started dating May and I went to a pool party at a mutual friend's house. After May and I arrived we drifted off to talk with people each of us knew best. After perhaps 45 minutes I needed to use the bathroom. As I entered the recreation room/bar area, who do I see but May. She was on her knees sucking some guy's cock as he sat on the couch. He had one of her tits out of the bikini top and was playing with her nipples.
I was stunned when I saw them, but May saw me and waved to me with the guy's cock in her mouth. I asked what the hell was going on. The guy responded: "She's sucking my cock!" I told him: "That's my fucking girlfriend!" I guess that put him over the edge. As soon as I said that he grabbed May's head and started cumming in May's mouth, looking down at her and over at me. After he dumped his load in her mouth he told me he'd heard that was a little Asian cocksucker inside.