Change in the stall

You follow her to the bathroom and each of you gets into a stall. As you start to unbuckle your jeans, you hear a wet sliding sound in the stall next to you. You look over and notice a hole in the stall at crotch height. "What's this hole for?" You ask as you pull off your jeans.

"It's for the girls to practice cock-sucking and using glory holes." She says as she wiggles some fingers through the hole. "Put your cock through here and some one would suck it. If you wiggle your fingers or tongue through it means you want to suck some cock."

"Do you get a lot of people in here practicing?" You say as you remove your underwear. She keeps wiggling her fingers in the hole, and you wonder if you should put your cock through.

"Well...?" she asks as she removes her fingers from the hole.