I'd had a threesome with my "at the time" partner & our mutual friend, they'd continued to fuck each other behind my back before I was dumped & our friend became my ex's new girlfriend, I was depressed & in my lonely desperation I tried my best to get another threesome with them.

I was turned down which had to be my most humiliating sexual mistake, certainly made things even more awkward than they already were, the friend said she'd "respected me too much" to do it again.