*** Friday: Morning ***
The next morning, I woke up early and got in the shower. The stream of hot water massaged my back, and my senses slowly re-engaged. I didn't feel as guilty about the night before as I thought I would, and I feared that I was becoming too accustomed to the way the two of us were blurring our moral boundaries. Maybe now that Mary-Kate had found sexual relief, the pressure would be off to go any further.
I wondered if perhaps ... Wait! What was that? I thought for a second that I heard the bathroom door open, but when I stopped scrubbing and focused my hearing, the room beyond the shower curtain sounded empty. I returned to soaping myself.
I wondered if perhaps last night had been the first time she had been so intimate with a guy. The way she talked, she seemed pretty naive, and she hadn't mentioned to me that she had a boyfriend. I can't imagine that my sister would encourage her to date, although Mary-Kate was 18 and certainly old enough to do her own thing. Maybe I was now the first guy to have brought her to orgasm. For a moment, that thought made me feel strangely proud, but then I got scared. I would have to remind her of the importance of discretion.
There! That sounded like water drizzling. I hooked aside a small portion of the shower curtain and saw my niece sitting naked on the toilet. Her legs were splayed slightly, and a thin stream of pee flowed from beneath her soft tuft of hair into the bowl below. A sharp tinkling sound cut through the dull beat of the shower's flow on my head.
She pulled some sheets off the toilet paper roll and gave her pussy a few gentle wipes. Then she rose, flushed and moved over to the sink to wash. Her soft, supple body flitted around the bathroom, naked and unguarded, like a little pixie.
I marvelled at the pertness of her cheeks as she soaped her hands, and I drew back the curtain even more to watch. In the mirror, I stared at her perky breasts that wobbled lightly as she bent over the sink. Then scanning over the rest of her body, I admired her young and unspoiled proportions. I let my eyes wander up her back to her shoulders and neck and ... In the mirror, I all of a sudden noticed that she was staring directly at me. I dropped my hold on the curtain and pressed back against the shower wall.
"Good morning, Unc," she called out to me.
"Good morning, Mary-Kate," I replied, trying to sound casual. "You shouldn't be in here when I'm taking a shower. Didn't you hear the water running?"
Suddenly, the curtain at the far end of the tub drew to the side, the shower rings screeching on the metal rod. "Well, I didn't think you would be peeping at me, you perv," she said, leaning her head in.
I quickly clasped my hands in front of me. "Mary-Kate! Close the curtain! You need to leave right now."
She stepped into the shower and drew the curtain closed behind her. "Why, Uncle Perv? You were peeking at my titties, so I should be able to peek at your wiener." She took a swipe at my hands, but I had a firm grip.
"Mary-Kate, get out!" I insisted.
She grabbed the soap from the side tray and squeezed her body around me to get closer to the showerhead. "Oh relax, Unc. I have to shower too." She started to suds her front. Her hands pressed and plied against her soft skin.
"Look at you covering yourself," she said, flicking a hand out again to try and dislodge my hold unsuccessfully. "You know, I've seen your wiener already. Why are you being so shy?" She massaged her breasts with her soapy hands, pushing and kneading the fleshy lumps around her chest. Then, she handed the bar to me and twirled around. "Here, do my back."
I hesitated for a moment but then decided to give her a hurried wash in order to get us out of this situation as quickly as possible. As I let go of my cover to grab the soap, my erection dropped in front of me like a weapon being aimed, and I shifted my hips back to keep it from touching her. I rubbed the wet bar superficially across her upper back, trying not to let my hand touch her skin, but I soon ran out of safe places to clean.
"My bum gets dirty too, you know," she said.
I touched the soap to one of her cheeks, and it yielded to my touch. I moved the bar over her bottom, which squished and mushed under my pressure. She reached around and grabbed the bar out of my hand. "You're not doing a good job. Use your hand."
"No. I ...," I protested, but she grabbed my hand and pressed it onto a cheek. My fingers melted into its softness, and when I swiped, my hand glided slickly over the smooth, wet surface. I wiped around and around on the one side and then moved over to the other. I lost myself in the feeling, and she pushed back against my ministrations. My erection wavered out in front of me, and I used the pressure from my cleaning hand to stop her from shifting into it.
"Unc!" she said in exasperation, "You're not cleaning me!" She grabbed my wrist and forced my hand into her bum crack. I tried to pull it back, but her grip was firm. My hand slid down between her cheeks. She turned her head and glanced at me. Her eyes were partly closed in concentration. "I think I need a lot of cleaning there," she purred.
I slid my hand up and down. Along the groove, I felt the pucker of her anus, and each time I swiped past it, she shivered. She leaned back into me until her head rested on my shoulder. She sighed and then brought my soapy hands around to her front, sliding them up to her chest. I closed them over her pudding breasts; her slick skin slipped between my fingers. "Ohhhh, Unc!!" she breathed.
I kneaded and rolled her breasts as if to soap them, but my manipulations were too deep, too luxuriating and too deliberate to be mistaken for cleaning. "Ohhhh!!" she purred again and leaned back further. Her ass cheek slid along the underside of my stiff cock and pushed it up against her lower back. "Mmmm!" she murmured, "What's that?"
She reached behind and grabbed my erection. I tried to jerk my hips away, but she had it in her grasp. She slid her closed hand up its length. "Oh Unc!" she exclaimed, "Your wiener is hard again!"
I broke free and shoved my back up against the shower wall. "Mary-Kate, that's enough! You need to leave right now," I insisted.
She spun around and glared at me with sparkling eyes. Some suds flew off her nipples as her breasts whipped over. "But Unc, I'm all soapy," she said, pouting. "I can't get out yet." She advanced towards me.
I tried to flatten my body against the wall tiles but couldn't avoid her approach. She pressed her soapy body against mine to prevent my escape. Her breasts deformed softly into my chest, and underneath them, her slippery hands closed around my balls and hard-on.
"Mary-Kate, back up," I demanded, "I have to leave." But she had me pinned.
She stared at me coyly through the tops of her eyes. The corners of her mouth curved up. She began to massage my entire groin with her hands. "Unc?" she asked, "Last night, what were you telling me would happen if I rubbed your wiener like this?" Her soapy hands slipped up and down on my shaft. Up and down. Up and down.
I looked down but could only see her face and compressed bosom. Underneath, her hands worked in a slow rhythm. Up and down. Up and down. "It would ... It would ...," I tried to reply.
Up and down. Up and down. "Uh huh?" she mused.
It felt so good. It was wrong to let her do it, but I didn't want her to stop now. "It would sp-p-p-purt ..." I was on the edge.
