TV wasn't the only thing turned on

My bedroom is accessed through a stairwell off the kitchen. So as I listened from the top of the stairs, I heard Charissa brush her teeth, pour herself some water, and head back down to the guest room. I pulled off my shorts, leaving me in my boxers and t-shirt, brushed my own teeth, and hopped into bed. I idly played with myself while remembering catching Charissa in her room wearing her bikini. I started to imagine some less innocent situations with that bathing suit...

Understandably, I stroked a bit harder as I imagined that bathing suit coming off... And then it hit me. She did take that bathing suit off! In fact, all four of us had put our swim gear in the laundry, and I had forgotten all about it until now. I had run a load of laundry before dinner, and now I knew that if they sat in the washer all night, they'd just be soggy and gross come morning. So, I put my cock back in my underwear and **** myself to head down to the laundry room to hang up the clean bathing suits.

I paused for a moment while pulling Charissa's bikini out of my washing machine. I enjoyed running my hands along the padded cups and sticking my fingers into the thin fabric that no longer protected her precious pussy during our drive home. With a heavy sigh, I hung her clothes next to all of ours and prepared to head back up to bed.

But when I exited the laundry room, Charissa's closed bedroom door caught my attention. Once again, I quietly padded over, imagining her sleeping on the other side of the door. I stood, silent, daydreaming of her dreaming. And that's when I heard the rustle from the other side.

The sound was unmistakable. The soft thwak thwak thwak of fingers in wet pussy. Even though I'd heard the sound more often than I could count from endless porn late at night, I still couldn't believe I was hearing it now, in the flesh, from my babysitter of all people! But yes, there it was: thwak thwak thwak. I could even hear Charissa's heavy breathing from the other side of the door and a moan or two.

"Damn," I thought to myself. "Game of Thrones really got to her!"

Never one to miss an opportunity, I pulled out my now raging cock and joined in the thwakking, though I was considerably quieter. I didn't let myself cum, of course, but I was in heaven as Charissa fucked herself mere feet away from me. Eventually, the rhythmic thumping came to an end, and a genuine moan floated out of the guest room. It was music to my ears.

Afraid that Charissa might head back to the bathroom, I quickly padded across the basement, tiptoed upstairs, and flung myself into bed. Not 30 seconds later, I followed Charissa's lead in cumming all over myself in bed. Too tired even to change my clothes, I fell instantly asleep and had many very pleasant dreams.