Cuckolded by Her High School Sweetheart

It was supposed to be just a party with our old colleagues, but suddenly I'm forced to watch as my wife's high school sweetheart teases her, and shows her what a real man can do.
There are no limits or boundaries.
The two of them do everything; from spanking to finishing inside her, all while others are watching.
The worst part? I can't stop myself from being aroused.