Mid-morning, two days later, Doris was out on a flurry of errands, and my father had left for the office several hours before.
I sat at the kitchen table looking out at the deep green of the back lawn, interrupted on one side by Doris's leafy garden and on the other by our bright blue in-ground pool. A bank of clouds had rolled in, leaving little pockets of sky for the sun to peak through. The sliding glass door to the porch had been left open, letting a waft of heavy air wash away the remaining odor of my father's fried eggs.
I was finishing up a cup of coffee, reading news on my iPad, and enjoying my free morning, when I heard the shower turn on upstairs. My shift at Gregories wasn't until two in the afternoon, giving me some much needed relaxation time. Hearing Natalie move around upstairs distracted me, and that distraction grew into outright arousal when my mind replayed what I had done to her in the bathroom. Within minutes I was gently stroking my cock over the top of my boxers and I knew I couldn't wait any longer.
I closed my eyes, my mind skipping to what she'd done to me on the couch during movie night, and I knew what had to happen. She'd object, of course, but that was part of the fun. I finalized my plan, if you could even call it that, as I climbed the stairs to the upper floor and waited for her outside the bathroom. The hallway carpet was soft and comforting under my bare feet and I wriggled my toes in it as I listened to the shower through the closed door.
I cracked the door open and peered inside. There was Natalie, rinsing soap off her pale, unblemished skin. The hot water cascading down the soft sensual curves of her body, leaving shiny wet trails of moisture clinging to breast, hip and buttock. I watched, my hand slowly stroking my cock as her hand slid between her thighs. She had her back to me, so I couldn't see the details, but it became clear she was doing more than rinsing. A soft whining moan came to me over the rushing of the shower and her head tilted back, sending strands of her hair falling behind to cling to her smooth back.
"Ohhh, Ohhh." Her moans were shuddery and seductive, and I longed to hear them whispered in my ear. Her hand moved faster and faster. Then, "Ohhh, God ... Josh, no .... We .... We can't ... no, please ... don't make me."
And then a deeper moan as she tilted forward, a hand splayed open against the slick bathroom tile. She clutched at it for the span of twenty seconds or so making mewling noises until she was finished.
I almost came in my shorts. I won't lie. It was a huge ego boost. I had never felt like more a stud in my life. My sexy sister had a kinky fantasy about me in the shower, rubbed herself into a shattering climax and needed a moment to compose herself after.
No, please. Don't make me, she had whimpered. It was her fantasy. She could make anything happen. And she did. She wanted me to push our boundaries and make her do things she wouldn't otherwise. Well, I was up to the task.
Carefully, I closed the bathroom door and waited.
Natalie finally came out. She blushed when she saw me and gave me a winsome smile. Her wet hair draped over her smooth bare shoulders.
"Your turn," she said, and gripped her towel at the top, her fingers drawing my attention to her breasts.
"Yes, it is," I replied. Stepping forward, I pushed her against the wall and leaned in for a kiss. She trembled against me, but parted her sweet lips all the same.
We kissed for the span of twenty heartbeats, before I cupped one of her perky breasts over the towel. I don't know why a simple mound of flesh should have such an impact on me, but kneading it was like scratching an insistent itch. Primitive need turning to satisfaction.
"W-we have to wait," she whispered, but I felt her chest rising and falling with each deep breath.
"We don't have to." I squeezed her breast a little more, feeling her towel loosen.
Natalie's head leaned back against the wall, her pink lips parting in response. "Please, Josh, we can't."
"There's something I want from you." Leaning in again and I trailed the tip of my tongue along the sensitive skin of her neck. Her shampoo had a tantalizingly feminine odor—roses, a sweet innocent smell that only stoked my desire. Before she could object I feathered kisses down her neck to her collarbone.
She let out a little moan and put her hands on my sides. "Four days ... just four days ... Please."
Her begging drove me wild, having the opposite affect than the one she intended.
"Now." I tugged her towel and it fell off, pooling at her delicate feet.
Natalie's entire body quivered against me. "Wh-what are you going to do to me?" she asked in a vulnerable voice. Her eyes stared up at me from under her long lashes. A blush had built up on her cheeks.
Kneeling down, I grabbed her towel and tossed it back into the bathroom, just under the towel rack. While knelt, I got a good look at her cute little pussy, the thin labia pressed into a tight slit.
I couldn't help myself. I planted a lingering kiss directly on it.
"Oh my God, Josh ... stop that ... "
I drew the tip of my tongue along her slit and was rewarded with a mewling moan. Her hands went to my head, gently grasping my hair. Toned thighs clenched together.
"You can't do this to me ... please ... it's not fair," she whined.
"Spread your legs for me, Natalie," I ordered. Testing the waters. I wanted to know how much she'd obey.
"J-just four days ... please, don't make me."
My cock throbbed with desire. Please, don't make me was fast becoming my favorite phrase. I fabricated a stern expression and shot it at her.
She gasped and her breasts heaved. Her nipples had hardened into little pink lumps. She squeezed her eyes closed and shuffled her feet apart, spreading her legs for me.
I pushed my tongue in deeper, and slowly drew it up, bottom to top.
"If you keep this up, you're going to make me cum." Her sweet voice trembled with desire.
I teased her again and again, watching her body language, assessing her arousal. Her juices started to flow, her face acquired a feverish flush.
"I ... I'm so close." Her hands clenched in my hair.
When her hips started to gyrate, I decided it was time to pull back.
I stood up and gazed at my beautiful, naked sister. A look of desperate need had taken over her face.
"You ... you can't leave me like this." One of her hands reached down and I snatched it away.
