Our parents met two years ago and had a whirlwind romance, marrying only three months later. It was weird getting a new brother the same age as me after 16 years of being an only child. I’m sure Ryan felt the same way. Ryan’s dad, Rick, was nice, and he treated my mom well, so, like most things, I just smiled and went along with it. 

Ryan was six feet tall, athletic, and had dark hair and brown eyes. His good looks made him very popular with our graduating class. The three of us finished high school last week and were enjoying the summer before college started. Ryan usually ignores me, and Samantha was too beautiful and popular to take notice of the awkward girl lurking around her boyfriend’s house.

Samantha was Ryan’s perfect match - she was about 5’4", blond, curvy, and had green eyes that always seemed to sparkle with mischief. The perfect little blonde bombshell. 

She had been the queen bee at our school and started dating Ryan during senior year. They were in love, supposedly. I had seen Ryan bring home a lot of girls in the last two years, but I’ve never seen him as obsessed as he is with Samantha. I think he would do anything she told him to. 

I understand why. Samantha was the type of girl that guys dreamed of being with. Full ass, tiny waist, and big tits that will fill large hands. She has something special that makes people stupid. Sometimes I catch myself staring at her. I’ve never been attracted to girls, but then I think most people would find Samantha sexy. I’ve seen her flirt with teachers and have them eating out of the palm of her hand. 

I was the typical wallflower. Cute, but not hot like Samantha. Black hair cut to my shoulders and a short, delicate body that tends to get overlooked. I’m thin with the small tits and an ass to match. I’ve never had a boyfriend and I’m okay with that. I was just ready to start college and forget all about my high school years as the invisible girl. 

“Ryan. She’s not supposed to be here.” I try to whisper, but from the smirk, Samantha gives the phone she’s playing with, she hears me. 

“Jesus, Kelly, we’re eighteen years old. We are old enough to have friends over when Mom and Dad are out of town.” I cringe like usual when I hear him say, Mom. It’s so easy for him to accept our new family. I couldn’t do the same. As nice as Rick was, he will never be my dad. 

Ryan rolls his eyes at me. “We’re going to watch a movie, eat popcorn and relax. Everything will be fine.” 

Samantha smiles my way. “You’re so cute. Such a little rule follower.” 

Even though Samantha looks like the typical mean girl, she has only ever been polite to me. Maybe a little disinterested but I understood that, I was hard to get to know. I’m a shy introvert who would rather be in my room reading than out at a party.

I go sit on the couch opposite the one Samantha and Ryan have settled in for the night. I’m wearing my most comfy pajama set. A plain blue T-shirt with matching shorts. I look like a baby in comparison to Samantha in her frilly green skirt and black tank top. 

The couple settles in to watch the superhero movie Ryan picked. They cuddle up together underneath the blanket that Mom keeps folded over the back of the couch. 

I grab my blanket and settle in on my sofa. I hate the movies Ryan picks and sure enough, my eyes are struggling to stay open about 30 minutes into the film.

I jerk awake to the room, completely dark. I lay frozen as my brain tries to catch up with where I’m at. I hear wet smacking sounds and whispering. 

“Are you sure she’s asleep?” Ryan whispers in the quiet room. Samantha responds “Yes, she’s been out for like an hour.” More wet smacking sounds fill the silent room and I realize they’re kissing. I don’t know what to do, so I just lay there unmoving, trying to think of a way out of this awkward situation. 

The kissing stops and I hear Ryan whisper, “Let’s just go to my room. I can’t fuck you while my sister’s in the room.” 

Samantha giggles and puts on a whiney baby voice. “I need you now.” The room is dark, but I can make out the dark shapes of their bodies moving on the couch across from where I lay. 

I’m ashamed to admit it, but I no longer want to leave the room. I feel my pussy grow wet from the sounds of my brother making out with his sexy girlfriend. I wish the TV was still on so I could catch a small glimpse of what they’re doing on the couch. 

Samantha lets out a sexy groan. “Just like that. Don’t stop.” She is louder than before, and I can hear Ryan shushing her. The kissing starts again, and I hear Samantha moan. “Mmm, that feels so good, baby. Don’t stop. I want to cum all over that big dick.” 

I try desperately to hold in my gasp, but I’m too stunned by what I hear. “Shit” Ryan whisper yells. I hear shuffling and then finally the click of the lamp by the couch turning on. Light fills the room and I see the couple clearly for the first time since I fell asleep. They are both rumpled. Ryan’s athletic shorts are twisted around his waist and he no longer has a shirt on. Samantha’s cheeks are flushed pink, and the straps of her tank top down off her shoulders. 

I’m struck by how Ryan looks embarrassed and slightly ashamed, but Samantha looks excited and like she just got exactly what she wanted. 

Ryan is blushing when he looks at me. “Sorry, Kelly. You fell asleep, and we got carried away.” 

Samantha smiles at me. “Did you like listening to me and your brother?”

Ryan looks at Samantha in shock. “Stop. Why would you ask that?” 

Samantha just laughs. “look at her, her cheeks are red and her little nipples are poking through her shirt. I bet if I touched her pussy, she would be soaking wet.” 

I see Ryan’s eyes dart to my tits and the hard nipples visible through my shirt. 

I just sit there wanting to defend myself but not knowing what to say. She’s right, I’ve never been this wet before. I can feel the wet spot on my little blue shorts and I’m careful not to move so they don’t see it. 

Samantha smiles. “I’m not making fun of you, Kelly. It’s normal to be turned on when you hear two people about to fuck. I bet my pussy is just as wet as yours. Do you want to see?”

Ryan glares over at Samantha. “Stop. You’re not being funny.”

Samantha glares back. “I’m not trying to be. She’s just curious. It’s okay if she wants to watch. Are you a virgin, Kelly?”

I nod back, still in a daze. “Have you ever seen two people fuck?” 

“Only in movies online,” I whisper. I can’t believe I’m still sitting here and haven’t run to my room to hide away in embarrassment. 

Samantha stands up and begins pulling her tank top over her head. Her braless breasts bounce free. The nipples are pink and puffy. She moves her hands to the waistband of her skirt and Ryan grabs her arm. “What are you doing?” he sounds shocked by her behavior. 

“She’s curious, so we’re going to teach her. Look at her. She can’t take her eyes off us.” 

Ryan stands up from the couch. “We can’t do this. She’s my fucking sister.” 

Samantha laughs and grabs the tent in his athletic shorts from his hard cock. “She’s barely your sister. She’s just going to watch. We won’t even touch her. Think of what a good brother you’re being for teaching her about sex.” She gets on her tippy toes and pulls his head down for a messy kiss. I once again watch Samantha’s magic as Ryan forgets all about me and gets lost in their kiss. Samantha pushes him back onto the couch and steps in front of him, blocking his view of me. She wiggles her tight ass out of her skirt and panties and straddles his lap. 

I pant as I watch them kiss. Ryan’s big hands cup and kneed Samantha’s ass as she rocks on his lap. They pull their mouths away from each other and I see Samantha lean back and Ryan’s head dip lower. I can’t see, but I know he is licking and sucking on her breasts. I want to watch as my brother sucks his girlfriend’s tits, but I’m too afraid to move for a better view. 

Samantha looks over her shoulder at me and winks. She crooks her finger, telling me to come closer. I shake my head no. I’m afraid if Ryan sees me, he will put a stop to everything, so I stay in my seat. I’m desperate to see how far they’ll go. I clutch at the couch cushion to keep myself from sticking my hand down my shorts to finger my pussy. 

Samantha, seeing my refusal, turns around on Ryan’s lap. Her back to his front. She is completely naked while my brother peppers kisses along her neck and massages her full tits. 

Samantha looks me in the eye as she spreads her legs, showing me her wet cunt. My brother reaches one hand down her front to massage her swollen clit.