All in

I turn and start to walk away... but then I stop and turn back to her. “Has my sister put that washing on yet?”

“What? I... No, I don’t think so” Alice replies, a little confused.

My cock is throbbing, heart pounding. I'm desperately trying to keep my breathing under control and to stop my voice from cracking as I realize what I'm about to do. “Good. Cause this towel could really do with a wash.”

Alice’s eyes go a little wide as she slowly realizes what I'm doing. I give a quick glance to the kitchen to make sure the coast is clear as I let the towel fall away from my body.

Pulling the towel away from me, I hold it out to Alice in one hand. A little gasp escapes both our lips as I feel my cock spring free, bobbing up and down a little before settling, erect and pointing almost straight at Alice. She can’t even pretend to hide her shock and joy at my sudden naked display. Her jaw drops and her eyes are glued on my body, yet under the shock there's a twinkle of pure delight in her green eyes.

“Well?” I ask, still holding out the towel to her. I'm becoming more and more aware of my situation. Standing naked in my sister's apartment, she could return at any moment, or her friends could arrive. Not to mention I’d just flashed my hard cock and naked body to one of her closest friends!

After moments that seem like hours, Alice eventually reacheds out her hand and takes the towel. “I had no idea my friend’s little brother is such a dirty little exhibitionist." She giggles. “Next time you’re in the shower I’ll have to strip down and join you. You need someone to show you how to wash, cause you are filthy!” She winks at me, something wild in her voice now and a hunger in her eyes.

There's a million thoughts rushing through my head, but I can’t think of a single thing to say. So I just smile and turn, letting her get another clear shot of my tight ass as I walk towards my room. I can barely believe this isn’t a dream.