I finished my intense workout, my body glistening with sweat as I made my way to the bathroom I shared with my little brother. I grabbed a towel from the rack and wiped my face, catching a glimpse of myself in the mirror. My muscles were toned and defined, the result of years of dedication to my sport. I was a tomboy through and through, and I loved every minute of it.
As I went to grab my toothbrush from the holder, my hand brushed against my little brother's instead. On a whim, I picked up his toothbrush and examined it. It was smaller than mine, with softer bristles. I couldn't help but smile as I thought about how he would react if he knew what I was about to do.
With a playful smirk, I used his toothbrush to scratch an itch on my ass. The sensation was unexpectedly pleasurable, and I felt a jolt of excitement run through my body. I chuckled to myself, shaking my head at my own audacity. From that day on, I started using his toothbrush every day after my workout, feeling aroused by the taboo act.
One day, my little brother got very sick and stayed home from school. I saw him innocently brushing his teeth in the kitchen, humming a tune as he went about his morning routine. I felt a twinge of guilt, but quickly dismissed it as my desire took over. I locked myself in my room, thinking about my little brother using the toothbrush that was in my ass.
I started to touch myself, feeling a rush of pleasure at the thought. I imagined my little brother, blissfully unaware, brushing his teeth while I masturbated in private. The thought was too much to handle, and I reached my climax quickly, feeling no shame or guilt, only satisfaction.
I got up, cleaning myself up and putting my little brother's toothbrush back in its place. I smiled to myself, already looking forward to the next day's workout and the forbidden toothbrush.
My little brother, still sick, continued to brush his teeth, humming a tune, completely oblivious to the secret desires of his tomboy sister.
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