Of course

You sigh like you're the parent giving in to the demands of a petulant child as you begin to fish your cock out of your pants and prepare to piss in your mother's waiting mouth. You remember that you need to keep her clean and the lazy bitch is too busy masturbating to bring her mouth to your penis, so you decide to bring it to her, beginning to crawl on top of her fat body in the tub.

You plant a knee firmly into each of your mother's massive breasts and lean all your weight on them as you lower your pelvis towards her face, inserting your flaccid dick into her gaping mouth, then leaning some of your weight on her head as well. This twists her neck over the edge of the tub in a way that must be pretty painful, considering how hard she has begun masturbating over it, she squeals with delight and swirls her tongue around your soft cock as you try to concentrate on starting your flow.

"Hold still, mom!" You shout, tersely. Her constant lapping at the head of your penis feels pretty good, but it's not why you're here. Yet. You're not good at pissing straight down her throat with a half hard-on like Cassidy does, so normally you've been pissing on her face from afar, not caring if she gets soaked in it. Unfortunately, this is a special occasion and she needs to hold still, for once, so you can keep her clean. You press your knees harder into her tits, as though to punish her for squirming, but she moans louder.

"Come on, ma.... I need you to hold still like a good little piggy while I prepare this... uh... dose." You say, gently trying to convince her, since you can't really **** her with **** at this point.

"Gu-ullk!" The living toilet exclaims, immediately trying to hold still to be a good mother and wait for her son to give her some much needed medicine. The question of why she would need to hold still to make the penis in her mouth cum this time doesn't even enter her head. Cassidy has trained her quite well. After silently crushing her face and tits for several more minutes, you give a small sigh of relief as you finally begin filling your mother's mouth with piss.

"Don't spill a drop, okay? Be a good pig." You coo gently as her cheeks begin to swell. She nods as best she can with you leaning on her face and swallows your 'load' repeatedly, making loud noises.

*gulk*....*gulk*.... *gulk*.... *gulk* The loud gulps echo through the quiet bathroom as you slowly relieve yourself, frequently stopping as her swallows stimulate your cock, causing it to grow down her throat as you get increasingly aroused. By the time you're finishing your last spurts you're doing it directly into her stomach, like your brother does. You're almost proud of yourself for overcoming this odd hang up, but now you're painfully erect in your mother's milking throat. She could probably use an ACTUAL dose, for once, if you want to trick aunt Rachel, after all. You decide now would be the perfect time to give her one.

"Looks like I'm gonna have a second dose ready right away! Isn't this new Zanalfil great?" You exclaim as you slowly begin bouncing your pelvis on her face.

Mom makes a squeal of excitement as you begin transferring all your weight onto her face then back to her tits repeatedly, nearly breaking her neck over the edge of the tub with each impact, causing her to orgasm with nearly every thrust. Her attempted moans feel great vibrating through your shaft, bringing you close to orgasm very quickly.

"Ugn! Gulp it down you fat pig.. UGN!" You begin firing a huge dose down your mother's throat, possibly her first real one in weeks, leaning all your weight onto her face and letting her twitching esophagus coax every drop out of your urethra to join the gallon or more of piss sloshing around her distended belly. You slowly bounce on her head as your orgasm subsides. "FUCK... YEAH! Thanks, mom!"

You give one last hump of satisfaction then hop off of your mom's fat body with a bounce, feeling extra refreshed from the orgasm, and one you can feel good about, since you actually gave her the medicine properly, for once. And a fresh bath too! She's practically being spoiled, you smile to yourself, then look down at your naked, wet, and obese mother, expecting her to keep masturbating happily over what you just did, but she doesn't move. At all.

Uh-oh.