A POV sleepover ends with wild group sex with monster cock

One of my best friends from school is coming to stay over and shower my girlfriend, she's beautiful and sweet and whenever she's over we make out, and she has a freakish, massive dick, he's the kind of guy you'd hear your bestie complain about and then wonder why they keep going back to having sex with him, anyway, one night I invite him to stay over because, like most relationships, we run out of presents and I'm trying to buy her something different, so he comes spend the night with us and my girlfriend suggests a sleepover.