This is about a straight-ish guy that drunkenly talks about his love of crossdressing and feminization to some guy and then gets drugged. Upon waking up, he is in total bondage, dressed as a girl. He soon finds out that is going to get paid to have a bunch of guys abuse him, but mid-way through him taking load after load, they find out he's a guy and decide to force him to drink more cum.
Description reminds me of It's a girl thing by Pangent617 (from bdsmlibrary).
But some details in description doesn't correspond with my memory of Pangent617's story