The New Family - Slow Burn with my step Sister - Part 2

Read previous part: The New Family - Getting Closer to my step sister - Part 1

That kiss in the kitchen haunted me for days.
Every time I closed my eyes, I could still feel Alexa’s soft lips on mine, the way her body melted against me, the heat of her bare pussy pressing against my thigh through the thin fabric of her shirt. I replayed the moment constantly - the taste of her mouth, the little moan she made when I squeezed her ass, the way she stroked my cock once through my sweatpants before pulling away with that dangerous smile.
Guilt ate at me during the day. She was my step-sister now. My father had married her mother. This was supposed to be a fresh start for all of us. But at night, when the house was quiet, the guilt lost the battle to pure, aching lust.
I started noticing everything about Alexa.
The way she would stretch in the morning, arms above her head, making her tank top ride up and expose the smooth skin of her stomach. The way her shorts clung to the curve of her ass when she bent over to pick something up. The soft laugh she made when she caught me staring. She knew exactly what she was doing, and she was enjoying the power.
We didn’t kiss again for almost two weeks. But the tension between us grew thicker every single day.
One Thursday night, our parents went out for a charity gala in downtown Seattle and wouldn’t be back until very late. Anna was staying over at a friend’s house for a sleepover. The house was completely empty except for Alexa and me.
I was in the living room watching a basketball game when Alexa came downstairs wearing nothing but an oversized Washington Huskies hoodie that barely reached mid-thigh. Her long legs looked endless. She wasn’t wearing a bra - I could see the faint outline of her nipples through the thick fabric.
She flopped down on the couch right next to me, closer than necessary, and tucked her legs underneath her.
“Mind if I join you?” she asked innocently.
I swallowed. “Not at all.”
For the first twenty minutes, we watched the game in silence. But I could feel the heat radiating from her body. Her bare thigh was pressed against mine. Every time she shifted, the hoodie rode higher up her legs.
Eventually, she turned to me.
“Sam… can we talk about what happened in the kitchen?” Her voice was soft, almost vulnerable.
I muted the TV and looked at her. “Yeah. We probably should.”
She bit her lip. “I haven’t stopped thinking about it. About you. About how you kissed me back.”
“Neither have I,” I admitted. “But Alexa… this is dangerous. Our parents are married. If anyone finds out-”
“I know,” she cut me off. “I know it’s wrong. But I can’t stop wanting you. Every time I see you, I get wet. Every time you look at me, I imagine your hands on me.”
Her honesty hit me like a punch to the gut. My cock was already rock hard in my shorts.
She noticed the bulge and smiled softly.
“See? You feel it too.”
She shifted closer until her breasts were lightly pressing against my arm. Her hand slowly moved to my thigh, sliding upward.
“Alexa…” I warned, but my voice was weak.
“Just tell me to stop and I will,” she whispered, her fingers brushing over the outline of my cock. “But I don’t think you want me to stop.”
I didn’t.
She leaned in and kissed me again. This time there was no hesitation. The kiss was deep, hungry, and full of weeks of built-up tension. Our tongues moved together desperately. I grabbed the back of her neck and pulled her closer.
She climbed into my lap, straddling me. The hoodie rode all the way up, and I realized she wasn’t wearing panties. Her bare, warm pussy was pressed directly against the bulge in my shorts.
We kissed like we were drowning. My hands slid under the hoodie and roamed over her smooth back, then down to her perfect ass. I squeezed the soft flesh hard, making her moan into my mouth.
“God, Sam… I’ve wanted your hands on me for so long,” she breathed.
She started grinding slowly against my cock, her wet pussy sliding along the length of my shaft through the thin fabric. I could feel how soaked she was.
I pulled the hoodie over her head in one motion. Her breasts spilled free - full, round, and beautiful, with perfect pink nipples already hard. I leaned forward and took one into my mouth, sucking gently at first, then harder. Alexa arched her back and moaned loudly, grinding faster against me.
“Yes… suck on them, Sam… I love the way you touch me.”
I worshipped her breasts, alternating between them, biting and licking her sensitive nipples while my hands gripped her ass, guiding her movements. She was soaking through my shorts now.
I couldn’t take it anymore.
I flipped her onto her back on the couch and moved between her legs. She spread them wide for me, looking up with lust-filled eyes.
“Please…” she whispered.
I kissed my way down her body - her neck, her breasts, her soft stomach - until I reached her smooth, glistening pussy. She was dripping. I licked her slowly from bottom to top, savoring her sweet taste. Alexa’s hips bucked and she let out a long moan.
“Oh fuck… yes… eat my pussy, Sam…”
I devoured her. I licked, sucked, and fucked her with my tongue while my fingers rubbed her clit. She tasted incredible. Her moans grew louder and more desperate as I brought her closer to the edge.
When I slid two fingers inside her and curled them against her G-spot while sucking hard on her clit, she came violently. Her thighs clamped around my head as she cried out my name, her pussy pulsing and flooding my mouth with her juices.
I didn’t stop until she was shaking and pushing my head away, oversensitive.
She pulled me up and kissed me deeply, tasting herself on my tongue.
“I need you inside me,” she begged. “Right now.”
I pushed my shorts down and freed my throbbing cock. Alexa’s eyes widened when she saw it.
“Fuck… you’re so big,” she whispered.
I rubbed the head up and down her soaked slit, teasing her entrance. She whimpered and tried to pull me inside.
“Tell me you want it,” I said, my voice rough.
“I want it,” she moaned. “I want my step-brother’s cock inside me. Please, Sam… fuck me.”
I pushed in slowly, inch by inch, watching her face as I stretched her. She was incredibly tight and hot. When I bottomed out, we both groaned.
“God… you feel so good,” I breathed.
I started thrusting - slow and deep at first, then harder. The sound of our bodies slapping together filled the living room. Alexa wrapped her legs around my waist and pulled me deeper.
“Harder, Sam… fuck me harder. I’ve wanted this for so long.”
I gave her what she wanted. I fucked her with long, powerful strokes, pounding into her tight pussy. Her breasts bounced beautifully with every thrust. She was moaning my name, nails digging into my back.
We changed positions. She rode me on the couch, grinding her clit against me while I sucked on her nipples. Then I took her from behind, bending her over the armrest, slamming into her while gripping her hips.
When I felt myself getting close, I pulled her up so her back was against my chest and fucked her standing up, one hand around her throat, the other rubbing her clit.
“Cum for me, Alexa,” I growled in her ear.
She came hard, screaming, her pussy spasming around my cock. The feeling pushed me over the edge. I buried myself deep and exploded inside her, filling her with thick, hot ropes of cum.
We collapsed onto the couch, sweaty and breathing heavily, still connected.
For a long time, neither of us spoke.
Finally, Alexa turned her head and kissed me softly.
“We’re so fucked,” she whispered with a small laugh.
I smiled against her lips. “Yeah… but I don’t regret it.”
She looked into my eyes, suddenly serious. “This can’t happen again. It’s too dangerous.”
We both knew we were lying.
Because the very next night, we did it again.
And the night after that.
And every chance we got.
Our secret had begun.
And it was only going to get more intense.