Take him up on his offer.

"Mmm so that dirty fucking asshole needs a nice wet tongue in it?" I purr a little as I crowd into the stall with the two of them. I reach back and close the door, throwing the latch behind me.

"Yeah you fat bitch. I bet you suck all the assholes don't you?" He grins up at me with slightly yellowed teeth.

"Only the dirtiest ones," I say.

He stands up, tuns a little, while keeping a firm grip on the cock sucking bitch's mouth. Locks her onto his cock like he never wants to let go.

I crawl down to my knees, so tight in the stall that there's barely room for me, him, and the bitch. He doens't waste much time in slamming her head up against the wall of the stall. His hips slap and pound over and over, driving her skull loudly against the metal.

It's difficult to match his strokes, but I get my face in tight to his hairy asshole; my tongue slides drunkenly, clumisly out to lap at his brown pucker.