The New Family - Younger Step Sister joined Us (step Brother and sister) - Part 5

Read previous part: The New Family - Got caught by younger step Sister while fucking step sister - Part 4

The days after Anna caught us were some of the most tense and electric of my life.
She didn’t say a single word about what she had seen for almost four full days. She acted completely normal around our parents - laughing at dinner, helping with chores, talking about college and her friends like nothing had happened. But whenever the three of us were alone, the air became thick and heavy.
I would catch her staring at Alexa and me with this intense, unreadable look. Sometimes she would blush and quickly look away. Other times she would bite her lip and hold the gaze a second too long. Alexa and I were on edge constantly, waiting for her to explode, to confront us, or worse - to tell our parents.
But she didn’t.
Instead, something else was happening inside Anna.
On the fourth night, after our parents had gone to bed, Alexa and I were in my room. We were trying to be quiet, but the tension was too much. Alexa was on top of me, riding me slowly, her hands braced on my chest while she rolled her hips in deep circles. I was gripping her ass, guiding her movements, when we heard the soft creak of my bedroom door opening.
Anna slipped inside and quietly closed the door behind her.
She was wearing a thin pink tank top and matching shorts. Her hair was down, and her cheeks were flushed. She didn’t say anything at first. She just stood there, watching her older sister slowly fuck me, her eyes wide and dark with something I had never seen in her before.
Alexa froze mid-motion, still impaled on my cock.
“Anna…” Alexa whispered, voice shaky. “What are you doing?”
Anna took a deep breath. Her hands were trembling slightly at her sides.
“I can’t stop thinking about it,” she said quietly. Her voice was barely above a whisper. “I keep replaying that moment in my head. The way you two looked… the sounds you were making… the way Sam was inside you. I’ve touched myself every night thinking about it. I feel so guilty, but I can’t make it stop.”
Alexa slowly climbed off me, my cock slipping out of her with a wet sound. She sat on the edge of the bed, still naked, and looked at her little sister with a mixture of shock and understanding.
“Anna… are you saying you want to… try it?” Alexa asked carefully.
Anna’s face turned bright red. She nodded slowly, eyes dropping to the floor.
“I know it’s wrong. You’re my sister. He’s our step-brother. But I keep imagining what it would feel like… to be touched like that. To be wanted like that.” She looked up at me, her voice cracking slightly. “I’ve never done anything with a guy before. I’m still a virgin. But watching you two… it made me so wet I couldn’t sleep.”
The room was completely silent except for our breathing.
I sat up slowly, my cock still hard and glistening with Alexa’s juices.
“Anna,” I said gently, “you don’t have to do anything you’re not ready for. We would never pressure you.”
She took a shaky step closer to the bed.
“I know,” she whispered. “But I want to. I’ve thought about it so much these past few days. I want to feel what Alexa feels. I want to be with both of you… if you’ll have me.”
Alexa reached out and took her little sister’s hand, pulling her gently onto the bed between us.
“Are you sure?” Alexa asked, stroking Anna’s hair. “This changes everything.”
Anna nodded, tears of nervousness and excitement in her eyes.
“I’m sure.”
Alexa leaned in first and kissed her little sister softly on the lips. It was gentle at the beginning, almost loving. Then it deepened. Anna moaned quietly into her sister’s mouth as they kissed for the first time. I watched, mesmerized, as their tongues met.
I moved behind Anna and gently kissed her neck while her sister kissed her lips. Anna shivered between us.
We took our time with her.
Alexa and I slowly undressed Anna together, kissing every inch of skin we revealed. Her breasts were smaller than Alexa’s but perfectly perky, with sensitive pink nipples that hardened the moment I sucked on them. She whimpered and arched her back as I licked and sucked them while Alexa kissed her way down her stomach.
When Alexa finally spread Anna’s legs and licked her for the first time, Anna let out the sweetest, most innocent moan I had ever heard.
“Oh my god… that feels so good…”
Alexa ate her little sister slowly and lovingly, showing her exactly how good it could feel. I kissed Anna deeply, swallowing her moans while my hand played with her breasts. Anna was shaking, overwhelmed by the new sensations.
When she came for the first time, it was beautiful. Her whole body tensed, her thighs clamped around Alexa’s head, and she cried out into my mouth as her first orgasm with someone else washed over her.
We spent the next two hours worshipping her.
I went down on her while Alexa sat on her face, teaching her how to lick pussy at the same time. Anna was a quick learner - eager, enthusiastic, and surprisingly talented with her tongue. Then I fucked Alexa slowly while Anna watched up close, her face inches away from where my cock was sliding in and out of her sister. She even leaned in and licked my balls and Alexa’s clit while I was inside her.
Finally, the moment came.
Anna was lying on her back, legs spread wide, looking up at me with nervous but excited eyes.
“I want you inside me, Sam,” she whispered. “I want my step-brother to be my first.”
Alexa held her little sister’s hand and kissed her forehead.
“It might hurt a little at first,” she said softly. “But it will feel so good after.”
I positioned myself between Anna’s legs. She was incredibly wet. I rubbed my cock up and down her slit, teasing her entrance, then slowly pushed the head inside.
Anna gasped, her eyes widening.
“Relax, baby,” I whispered, stroking her cheek. “Breathe.”
I pushed in slowly, inch by inch, watching her face the entire time. She was unbelievably tight. When I finally bottomed out, she let out a long, shaky moan.
“Oh my god… you’re so deep…”
I stayed still inside her, letting her adjust. Alexa kissed her sister and rubbed her clit gently to help her relax.
When Anna finally nodded, I started moving - slow, gentle thrusts at first. Her pussy was gripping me like a vice. She was moaning loudly now, her hands clutching the sheets.
“Faster, Sam… please…”
I picked up the pace, fucking her deeper. Alexa leaned down and sucked on Anna’s nipples while I thrust into her. Anna’s moans became louder and more desperate.
“I’m gonna cum… I’m gonna cum on my step-brother’s cock…”
She came hard, her tight pussy squeezing me rhythmically as she shook beneath me. The feeling was too much. I buried myself deep and came inside her, filling her virgin pussy with the first load of cum she had ever taken.
We stayed connected for a long time afterward, all three of us breathing heavily, kissing softly, touching each other gently.
Anna had tears in her eyes, but she was smiling.
“I can’t believe I just did that,” she whispered. “It felt so good…”
Alexa kissed her little sister lovingly. “Welcome to the club, baby sis.”
That night marked the beginning of something much bigger.
From then on, the three of us were inseparable in the most intimate way possible. We fucked every chance we got - sometimes just Alexa and me, sometimes just Anna and me, but most often all three of us together. The sex became even more intense, more passionate, and more addictive.
But with every amazing night came the growing fear that one day our parents would find out.
And that fear only made us want each other more.