Sadie:

15.
Wetting a dress/skirt/shorts

(and this is gonna be hella nsfw just fyi)

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“Good girl.”

Sherlock felt heat bloom across his cheeks as he blushed, despite his best efforts not to. He concentrated on the looping pattern of the carpet under his feet (while trying to ignore his reflection in the shiny, white, patent leather of his buckled shoes).

“A bit higher, love…let Uncle Greg get a good look at you.”

Sherlock’s belly gave a funny, albeit not unpleasant twist at the words. He obeyed, and lifted the ruffled hem of his pink tulle skirt. Underneath, his cock strained heavily against the thin fabric of his matching panties…already, there was a tiny, darkened spot where a bit of precum had leaked.

Across the room, Greg tsk’ed; “Stained your knickers already, muffin? That’s not good. Come here.”

Sherlock swallowed thickly and walked towards Greg, the spot on his panties already growing.

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“That’s it, there’s a good girl,” Greg practically growled, his voice a constant rumble in Sherlock’s ears. “Just a little more, that’s it…show me how good you are.”

Sherlock grunted as he rocked against Greg’s thigh, straddled between his thighs. “I, I, I…” Sherlock breathed, unable to say or even think more than a string of barely comprehensible words. “G-good, yeah.”

“ ‘Yeah’, what?!”Greg reached back and swatted Sherlock’s panty-clad arse, and Sherlock sucked in a sharp gasp as the throbbing in his cock quickened to a pace that made him see stars. His grinding became frantic. “Y-yeah, ungh, y-yes, yessssir!” he babbled.

Greg rumbled his approval as he kneaded Sherlock pert little asscheek in his hand roughly. “Better.” He then took both hands and suddenly held Sherlock’s waist, stilling him.

Sherlock mewled pathetically…he’d been so close.

Greg squeezed, and Sherlock gasped again at the sharp pain from Greg’s fingers digging in to his flesh.

“Now..,” Greg let one hand drift to Sherlock’s cock and play with it through the silky-soft garment, using one fingertip to trace the outline from his balls to the head, making Sherlock twitch–

  “…piss yourself.”

Sherlock moaned and let his head fall back as he began to pee, a thin dribble and quickly turning into a hot, thick flood as he let go what he’d been holding back since their game began.

Greg gritted his teeth as he watched his hand get coated in hot piss and yanked the waistband of Sherloc’s panties down, freeing his still-pissing cock and flinging droplets onto his own shirt. “Jesus fuck,” he groaned, and then took Sherlock’s cock in his hand and started to rub him off. “Filthy little girl, you’re Uncle Greg’s disgusting little piss princess, aren’t you?!”

Sherlock was wordless as he began to thrust in Greg’s grip. They were far from finished with their game.

Uncle Greg had a piss kink. And Sherlock was all too eager to play along.