Man the secret gloryhole

You remembered a myth that there was a secret gloryhole connected to the men's bathrooms. It was big news on the rumor mill to your friends, but you know where it is, and that was where you were going to go. Taking a path backstage, you make your way to the hidden door at the back corner of a wall, cleverly disguised with jet black lining. Inside was what looked like a small concrete room. A single dim lightbulb hung above your head, shedding faint yellow light in your field of vision, and on the far side was a decent sized hole located about waist high off the ground. About a foot upwards and to the left of the hole was a slot that was big enough to fit standard dollar bills, and a wooden receptacle to receive it. On the floor directly in front of the hole was a dirty pillow attached to the ground, with just enough space for a pair of knees. As you examine the walls closely, you notice that it was covered in graffiti. There were tally counts, smiley faces, various shows of sexual profanity and the like. One of them was directly above the hole, and it read in clear letters, 'Suck here'. Close to it was a big red button labeled, 'Press to Open'. Off towards the side was a whiteboard with written words in black marker:

'$10 per load! No cash, no happy ending, and for god's sake, no change!'
'No chatting to the lads, no peepshows and no watersports!'
'Keep door locked at all times! Don't let them see you!'
'No cuts! Keep all you earn, you dirty sluts!'

There was a scribbled note on the whiteboard that said that on the other side was a similar sign, so the men would know the rules. However, they were allowed to talk, but like the instructions say, you cannot respond to them. Next to it was a pinned photo of what the hole looked like from over there. It looked as conspicuous as it was meant to be. There was graffiti writing all around it, of which you cannot identify. You do, however, notice that the hole was encompassed by a crude drawing of a woman's pursed lips, along with an arrow with a label reading 'Cum in here', and another next to it reading 'Will swallow for the $$$'.

After understanding the instructions about how this works, you turn around to turn the latch on the door before kneeling onto the pillow. There was the strong, intoxicating scent of all the previous users that had been here, but you paid it no mind. At eye level, you can see the men's bathroom on the other side through the perfectly circular opening, which was as dimly lit as the room you are in. It was a dirty place, with old sinks, urinals and cubicles, much like the women's, only without the sneaky gimmick like the one you are seeing through right now. Your body acted on its own as it reached for the red button to press it. The room was filled with a haunting glow as a red light buzzed into existence above you.