On Wednesday, Mary suggested a naughty idea based on her fave aunt/nephew scene to occur on Friday at exactly four. I grew very excited just thinking about it, playing it in my head. I hurried to her place on Friday afternoon, timing my arrival the appointed time. I let myself in, took off my shoes and walked quietly back to her bedroom. I heard the shower running and saw the door to the bathroom ajar.

The designer of her bathroom was likely oblivious to a basic privacy flaw - the whole the glass shower enclosure could be seen in reflection from the vanity mirror through the barely open door. In the shower, Mary was lathering herself in the warm spray. She slowly pivoted and bent as she scrubbed, providing a full view of her naked, suds-covered form.

I opened my pants and began to stroke myself as I watched, I intentionally continued - not withdrawing - as she turned off the water, stepped out and toweled-off. She pulled on a short robe and opened the door to ‘find’ me masturbating there.

“Why you naughty boy,” she scolded in mock surprise. “How long have you been watching me?” I shrugged wordlessly and she turned back into the bathroom and was quickly back facing me this time holding a bath brush. “I’m going to teach you a good lesson for peeping on me like this and jerking-off while you watched” She led me to the end of her bed, me hobbled by the pants around my ankles. Her robe fell open as she pulled me across her lap.

The brush was a wickedly effective tool that we had both used before and soon my rump felt like it was on fire. Throughout the spanking I was bobbing and writhing in cadence with the swats, my cock sandwiched between her bare and still damp thighs. She paused the spanking just as I reached apex and released on her legs. She squealed in pretend surprise, “What have you done now?” She resumed spanking, even harder with our bodily interface now very sticky. Eventually she paused and prompted me to stand.

“I think I need another shower,” she declared, looking at the mess on her thighs. She wiped a rivulet of semen from between her legs and offered me her finger and I licked it clean. “Wanna join me?” I nodded enthusiastically and she suggested, “Perhaps you need to pre-clean my thighs and kitten with your tongue, first,” she suggested. I knelt, growing hard again and eagerly began the assigned task.