It ends up on her face, along with the next one

After a minute or two of frantic-yet-shallow facefucking, the man thumps on the bathroom wall.

Your mother quickly pulls away, her lips leaving the small red cockhead just as a jet of cum bursts from the tip. It’s followed by another, then another; she’s only inches away, but instead of taking him back into her mouth, she just sputters and blinks while the jizz splashes across her face.

“Oh man, jeez, what a silly accident,” you quip, patting Mom on the shoulder. “Bad timing, huh?”

“I—He... Dammit,” she moans, before finally getting it together and licking the last few drops of cum off the man’s tip. “...I barely got any...”

“Don’t worry,” you say gently, getting your own cock out just as the one in the hole disappears. “I’m sure there’s more customers waiting, and I’ll help you out too.”

Before she can reply, another man’s junk appears. This one makes quite the contrast with the last: it’s thick, black, and just about the longest you’ve ever seen.

“Oh God,” you and Mom say simultaneously. After a moment of silence, she speaks up again: “...That one’s gonna have lots of medicine, right Baby?”

“Totally.” With that you place a hand on the back of her head, guiding it back to the glory hole while you begin jacking off. “Suck it, Mom.”

The sheer size of the cock in front of her makes her hesitate for a moment... But that instinct is soon overruled by the part of her that knows just how badly she needs a dose of jizz to survive. After all, you and Cassidy have only given her one load each today, and she’s getting dumber by the minute.

With her inhibitions fading (and a little help from your hand), Mom takes the huge member between her lips. One inch disappears inside, then she bobs her head a few times before trying to go deeper. Two inches, then three... She bottoms out about halfway, using her hands to pleasure the rest of the shaft.

Meanwhile, your own hands are moving too: one is trying to push her further down, pressing the cock’s bulging tip against the entrance to her throat. The other is stroking your own meat, which is at full attention from your mother’s humiliating display.

“Gch... Gch... Gaaack!” Her eyes go wide as her resistance is broken and the cock slides into her throat. It’s a tight fit, but at least the passage is lubed; you can tell that much from the waterfall of drool and pre-cum that’s spilling down her chin.

“Good girl... Good fuckin’ girl,” you hear a low voice moan on the other side of the wall. You think you can hear another man reply, but you can’t make out any words. “Yeah? Lucky motherfucker...”

"Mph!" your mother's trying to pull back now, but your hand holds her firm as the anonymous, well-hung man forces his cock back and forth in her throat. "Mgh!"

"Keep it up, Mom," you gasp, jerking off even faster. "You never know when he's gonna give you that dose."

She relaxes a little at that, placing her hands on the wall to keep herself steady. "...Mm..."

You keep holding her down, just in case... But as the man on the other side lets out a low moan, you realize that Mom's in danger of actually getting the medicine she needs. What if he doesn't give us any warning? Sounds like he's getting close.

He's not the only one, though; a few more strokes and you're almost ready to bust another nut. Thinking fast, you pull Mom away from the glory hole and towards your own crotch.

"Hgh... Honey, I need to keep going," she sputters, looking up at you as she goes back to jerking off the stranger's huge cock. "What are you--"

"Gonna jizz soon," you reply, raising your voice so that she can't hear the frustrated moan coming through the wall. "Open wide, Mom..."

She obeys, although her gaze keeps darting back to the twitching shaft between her hands. Her fears are warranted: you're not quite ready to cum yet, but the stranger sure is.

With a final grunt, the massive cock begins unloading, painting the side of her face with rope after rope of thick seed. She turns back to it, trying to catch some in her open mouth, but a thick wad splatters into her eyes. Startled and blinded, she completely misses the rest of the load.

Just as the black man finishes pumping cum onto Mom's frustrated face and nearly-naked body, your own orgasm hits.

"My turn," you groan, beginning to add your load to the mess. With her eyes plastered over and her attention still on the glory hole, Mom doesn't notice that your dose is being wasted until it's too late. She stops licking the stranger's spent cock and switches over to yours, only to find that you've already poured every drop of medicine onto her skin.

"Guh... Oh God, oh fuck, I need to get some of it," she mumbles, scooping some of the jizz off of her body and slurping it down.

To stop her from drinking too much medicine, you lean down and give her ass a hard slap. Given that she's half-blind and squatting awkwardly, that's enough to send her tumbling onto the floor.

"AH! Cassidy!"

"S-sorry, Mom, you just look so hot..."

She doesn't reply, simply breathing heavily for a moment before resuming her clean-up. You interrupt her again, though, grabbing her shoulders and pulling her up into a sitting position.

"Wha--"

"Look, Mom. You're not done yet."

While you were unloading and your mother was trying to deal with the aftermath, the black cock retreated through the glory hole and was replaced. The new member is looks very familiar... Your house has been pretty nudity-friendly lately, so you have no trouble recognizing your brother's cock.

With her vision blurred, all Mom sees is another source of valuable "Vitamin S." She scrambles to get Cassidy's dick in her mouth, pressing her cum-stained body against the bathroom wall as she bobs her head down its entire length.

"Gack... Gack... Guuugh..." You watch with a grin as she practically chokes herself, **** for Cassidy's sperm. Your eyes are drawn to her ass, which bounces with every thrust... Then to your cockhead, which is still lubed with plenty of cum.

Fuck it, you think, squatting down to straddle her rear end. She hardly notices as you grab her ass and dry-hump it, working up a new erection while she swallows your brother into her throat. Then you lean heavily on her back, forcing her lips right up against the glory hole as you line up with her asshole.

You hear Cassidy moaning, but once you push inside he's drowned out by your mother's muffled cries.

He's gonna cum in her mouth, you think, plowing Mom's ass with slow, deep strokes. Ah, fuck it... Can't starve her out forever, I guess, and I sure can't stop Cassidy from fucking up ALL the time.

As if on queue, you hear something moving around on the other side of the wall.

"Muh... N-no, come back," Mom says, her mouth suddenly empty.

"Relax and open wide," Cassidy replies, growling a little to disguise his voice. Your mother does what he says, keeping her mouth open and her face against the wall. "Here yah go!"

There's a peculiar edge in his voice, and you can tell that he's holding back laughter. Mom's slurping and swallowing... But if you know your brother, it's probably not cum.