Trashcan, Overflow it, Your Mom.

John's Mom heard him masturbating again in his room. It was louder than usual. She was planning a night of masturbation for herself, aroused by the idea of her son growing into his sexuality recently, and the fantasy of a younger partner had her more horny than usual.
She hid it well most of the time, but she'd been delving into **** porn recently, and was worried her son had seen a hint of just how much it turned her on.

She glanced in through the partially open door as she passed by on the way to her room, hand already massaging one huge nipple. Her nipples were constantly hard lately, always rubbing against the pads she used to hide them in public. Not in a bad way, but damn it didn't help with the arousal. She'd actually orgasmed simply by stimulating them just last night, a first.

John was a modest boy, at least since the later stages of puberty, and she hadn't seen him naked in a couple years. Thus, it was not surprising for her to freeze in shock at the view through his bedroom door - her son vigorously masturbating a giant cock to what apparently was porn on his phone (she could not see details).

He had to use both hands, and she caught the bouncing of a huge pair of balls as he continued.

"You like that Jane?", he groaned, staring at his phone as he stood and kept masturbating, cockhead aimed at his trashcan. "Do you want my cum in your ass? Yes you do, fuck yes, TAKE IT!" The vocalized portion of what was apparently a fantasy about anal sex with (that unworthy slut) Jane ended in a half groan/half shout, his hips thrusting and balls clenching as a massive blast of cum bounced off the side of his trashcan, splatters escaping to land on nearby objects and the floor.

He just kept cumming, blast after blast splattered into the trashcan, until it started to overflow. Trails of cum dripped down from it's edge as he finished, a small puddle around it on the hardwood floor (yep, I knew it was a good idea to avoid carpet in his room).

Damn.
That trashcan could hold at least a gallon or two.

She realized her other hand had hiked up her skirt and was rubbing her pussy through the soaked panties covering it. Her son was a fucking stud, the smell of his massive orgasm had her almost cumming herself, and if she didn't get out of here she'd probably get caught masturbating to her son masturbating. That'd actually be kinda ho...no no no, get out get out, MOVE!

She quickly moved away and tried to silently make it down the hall to her own room.

Tonight she'd need the big dildo.

She didn't notice the partial footprints she left behind, trailing from the small puddle of cunt juice outside her son's door, fed from the rivulets running down her legs.