Yes she joins you.

You start the shower as normal, making it piping hot to clean all of your Mom gunk off you. The temp is ready and you get in. Right as you go to close the shower curtain Joanne walks in, “I’ll be there in a minute darlin’ just need to use the facilities.”

You reach out and grab her arm and pull her in. “Ryan what are you-” You kiss her and the still liquifying cum gets caught on both of your lips. After a few moments you begin lowering yourself and kissing her body on the way down, you kiss her neck, her chest, then her heaving breasts and wide nipples. Her bloated belly feels nice on your lips and you jiggle her a bit playfully. Soon you’re on your knees and lapping up deposits of cum on her pelvis and the base of her shaft.

“Baby I really need to pee.”

You take her cock in hand and let her glans rest on your lips. “SO, just go here in the shower.”

“But Ryan are you sur-”

“Like you said Momma, I’m a proper cock slut now. I want everything this beautiful dick can provide.”

You suckle at her cockhead driving your tongue deep into her pisshole. She shudders.

“Momma?”

“Yes dear, are you sure you want this?”

“Yes, give me your waste.”

“Ohhhoooo”

A jet of hot piss splashes you, you quickly open wide and let it fill and fill your mouth. You ignore the taste but let the rank smell hit your nose. Soon you’re overflowing with her feminine rank refuse. Her body shudders throughout the long process of emptying her bladder into her son's eager maw. The immense volume is flowing out of your mouth and down your chest. The hot water is still beating down on your back. As her stinging stream slows you spit out the rest and it splashes on the tub floor. You then take in her cock like before but in one swift stroke you suck down her half hard length, her remaining yellow gold sprays down your throat without tasting it. Joanne moans and coos in ecstasy as her need to relieve herself transforms into a renewed lust. Her cock swells once more and you begin full length strokes of your mouth swallowing her whole.

“Oh goddess! I want to fuck you so bad!”

Her hands grab your head and she leans over your head driving her cock home. She proceeds to keep her shaft as deep as possible as she lets her wide frame swallow your head into her soft curvy rolls. Short hard deep thrusts provide the new soundtrack and in minutes she busts another fresh load deep into your guts. Massaging her balls, you confirm that they have shrunk by at least half. You unhitch her shaft from your jaw and stand up. Moving aside, the hot water now beats down on her body and her still fairly hard dick. You stroke and clean it and you each proceed to lovingly wash and clean each other all over. As you step out and dry each other you can’t help but kiss here and there.

You say goodnight and kiss her one last time on the cheek before heading to your room.