**You can view the illustrated version of STEP-BROTHER GROWS UP at** [https://eroticprose.com/](https://eroticprose.com/)
I hated my younger step-brother the whole time we were growing up together. He was two years my junior, and his whole life seemed devoted to trying to drive me around the bend. As a little kid, he used to pull the heads off all my dolls or give them crewcuts when I wasn’t around to stop him.
When we were older, he used to spy on me, trying to catch a glimpse of me naked. His favorite stunt was to sneak into the bathroom when I was in the shower. I caught him several times, as he peeked around the edge of the shower curtain, getting an eyeful. The happiest day of my life was when I finally got to go away to college.
When I came home this year for summer vacation, my step-brother had just turned nineteen. To be quite honest, I hadn’t wanted to spend the summer at home, but I couldn’t find a job in the small town where my school was located. I needed money, so I didn’t have much choice.
Besides, I’d broken up with my boyfriend and nothing was keeping me there. So I packed up and headed back to the nest.
I wasn’t prepared for the changes that had taken place in Rob. In the first place, he’d turned into a man since I’d seen him last – his cheeks were rough with stubble and the hair on his forearms had grown in thick and curly. Something had also happened to change his monster personality. When I drove up, he came bounding out to the car and insisted on carrying my luggage upstairs for me. When I got up to my room, I was fully prepared to find all of my things out on the lawn under my windows, but they were neatly piled on the bed.
“Glad to have you home, Kris,” he said, his voice newly deep and gruff. Then he hugged me and gave me a peck on the cheek. His body was like a rock under the baggy clothes he was wearing and the lump in his pants that pressed against me when he hugged me, felt a lot bigger than the bulge in the front of my ex’s boyfriend’s trousers when he was dry humping me after a date.
“Thanks, Rob,” I said, looking up into his big blue eyes. The step-brother from hell had turned out to be quite a looker with his dark curly hair and his chiseled features. His lips were full and red, looking good enough to bite into. I pushed him away gently and turned to start my unpacking. I was embarrassed by the fact that my nipples were getting hard under the thin fabric of my blouse. I must have been hornier than I thought if my own step-brother was starting to give me a wet spot in my panties!
The next morning I was in the bathroom, putting in my contact lenses when the door suddenly swung open. I looked up and there was Rob, his broad shoulders filling the door frame. He was stark naked and my jaw dropped when I got a look at him. His torso looked like it had been sculpted out of marble – his big pecs square and tight, the ripples in his belly cut deep. His arms and legs were thick with muscle, big veins clearly visible from shoulder to wrist.
His arms and legs were covered with silky-looking dark hair, but his chest was smooth and the only hair on his belly was a fine line that ran from his navel to the dense thatch in his crotch. And his dick was long and thick, hanging heavily between his bulging thighs.
“You’re gorgeous!” I blurted, feeling myself blush to the roots of my hair.
“Thanks. So are you sis,” Rob grinned, not fazed by the fact that we were both naked as jaybirds. He was looking me over appraisingly and I could practically feel the heat of his lustful gaze on my firm breasts, training down over my tummy to my silky bush. Our coloring was identical, I noticed. Rob’s nipples were big and dusky red, just like mine, and our bushes looked damn near alike, except his was much denser than mine. I could feel the heat starting in my belly, spreading rapidly into my tingling pussy. My nipples just barely hidden by my arm were tightening into sensitive points.
Rob was getting turned on as well, his big cock getting even bigger. Another minute like this and my step-brother was going to be pointing at me – and not with a finger! “I’ve got a job interview,” I said finally.
“I need a quick shower, then I’ll be out of your way.”
“I’ve got to get to work myself. We could shower together.” The look he gave me left little doubt as to what he had in mind, but I nodded my head in agreement anyway. Rob shut the door behind him and stepped past me to turn on the water. His brawny arm brushed over my nipples and I shuddered, my cunt contracting with a thrill of a guilty pleasure. I glanced back at Rob. He had a great ass, tight and round and furry.
His big balls were hanging down between his thighs and I reached down and ran my finger down over the silky bag containing them. He groaned and put one leg up on the tub, fully exposing his big family jewels. I stroked them again and they started to move, pulling up into a tight knot.
He stepped into the shower enclosure and held the curtain back for me. I joined him and proceeded to do what I had never even considered doing in my whole life fucking my younger step-brother.
He grabbed me and pulled me close, his hard cock hot and throbbing against my tummy. His tongue forced its way between my lips and I started kissing him back, my mind short-circuited by passion. His hard body crushing against me sent sparks of lust up and down my spine as the hot water poured down over us. His hands were stroking my sides and ass, and he was whimpering with desire as I dug my nails into the bulging muscles of his broad back.
My step-brother pulled back just long enough to slip his hard cock down to my box. I reached down and pointed the blunt head in the right direction, then smacked his fuzzy ass. He bucked hard, driving his thick meat deep into me.
I cried out, wrapping one of my legs around his bulging thigh as he started driving it in and out of my cunt, sending shivers from my head down to my toes.
I put my hands around his narrow waist and leaned back. Rob bent his head to my left breast, his long tongue tracing circles around the aureole of my swollen nipple. Then he started sucking it, cupping my breasts in his big hands.
The longer he humped me the harder his prick got, till it was flexing and bucking up in my twat like a wild thing. Suddenly he lifted his head and stared at me with startling blue eyes. “I’m cumming, Kris,” he groaned, his hips slamming against me. I tightened the walls of my pussy, grabbing at his big dick as he blew his cream deep inside of me. His hot sticky juices triggered my own orgasm and I gyrated my hips around the axis of his fat dick, sending bursts of pleasure through my frame. When we were both drained totally, we slumped together, panting.
When I finally lifted my head from his chest, Rob was grinning at me gleefully.
I think it’s going to be a pretty damned good summer after all!
Source: reddit.com/r/eroticliterature/comments/ltpxqw/mf_stepinc_stepbrother_grows_up_this_is_the_story
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