What the hell am I seeing? Damn, if I didn't see it, I wouldn't believe it...

It must be tough to accept that your girlfriend, besides sleeping with you, also goes down on another girl, meaning she enjoys both pussy and a good cock. And honestly, that's something to be proud of, no doubt about it, haha. But of course, if you found out about it because you're a voyeur, I don't know how good it is, but since it happened, he'll probably think he might as well enjoy it...