my little slutty sister

My sister and I go to the same school. But there's one problem, my sister is a whore. At home, she keeps telling me how much guys love her and she gets dick when she wants. It's wrong to think about it, but she's right. I'm a thin, medium-height guy and I'm still a virgin. Diana is only 15 but.... she has long, curly blonde hair, a nice round butt, a cute face, and blue eyes. At first, she might seem like a cute girlfriend type, but she's not.

After one school day, I was impatiently waiting for her in front of the school entrance. We usually go home together or our dad comes to pick us up with a car. I couldn't wait any longer, so I went in to find her. Moans came from the boy's toilet. My body trembled, but I kept going. Diana was being fucked by 4 piece of upperclassman guys next to the tiles. The guys laughed cruelly, but Diana didn't care.
-Ohh, even harder, fuck my ass harder, don't leave me dry!
-Isn't anything enough for this whore? Come on, little one, you can have my cock too.
Diana screamed, while she stepped in front of the other guy and forced his oozing cock into her mouth.
-You suck like a pump.
-Hey, let me in here too, I'm coming!
-You fucked her ass first, wait a minute, buddy!
My sister was laid on their laps and they started to ride them lustfully. The cock shook in her round ass. She tossed her wavy hair back. The sight made my pants harden. I didn't dare to speak but I didn't want it to end either.
-Guys!! Enjoy it on my face!
Diana fell to her knees and waited for her reward like an obedient animal.
-Open your mouth, slut!
A thick white streak came down my sister's face, then another from the next guy.
-MMM, divine.
My sister gargled the guys' cum and licked their cocks clean.
They started getting dressed and I had to hide somehow. I ran to the edge of the neighboring women's bathroom, hoping that no one would be there. The guys were slapping and laughing as they passed me. Once the area was clear, I quickly hurried back to the front of the school. My sister arrived about ten minutes later.
-What took you so long?
-Uhmm..... the time was delayed and I couldn't speak.
-You could have written a message!
-Sorry, sorry, but what does it have to do with where I am and what I'm doing anyway, you can't go home without me?!
I didn't bother her anymore so we went home in silence, but the whole time I had the feeling I saw earlier. "Didn't I just want my sister?" I knew full well that I wouldn't have a chance with her, not just because I'm her brother, but because I'm not a good guy and she doesn't need me anyway since she can always find someone else.

The next day my friend Josh called me to ask if he could come over to our place for the weekend. We hang out a lot. He's my best friend. Sometimes I go over to their place or vice versa. Usually, gaming, drinking beer and talking is the program, but at the same time, the topic of girls is usually on the agenda. Josh, on the other hand, is not a virgin, he's been in a relationship with 2 girls. A casual relationship and a more permanent one that lasted 3 years. He's single now. He teased me so much about what kind of guys he used to fuck with his girlfriend and that I don't know what it feels like.

Saturday night. With my best friend after a long school week together, without my dad. What could go wrong? Diana... Well, my sister walked around the living room and the whole house as if she didn't mind that there was another guy besides her brother. Her toned and shapely legs were exposed. Her hair wasn't as neatly combed as it usually is. She was wearing a thin nightgown that showed off her breasts. Josh looked at my sister as if he was seeing some kind of miracle. To be honest, I can't blame him. Unlike me, my friend had become a lot more masculine, which Diana must have noticed. I tried to push him away from us, but he flirted with my friend whenever he could.
-Don't think about it!
-What?
-You know what I mean, you're constantly looking at my sister.
-Oh man, I just looked at you, it's been a long time since I met your sister.

I came to my senses in the evening. I woke up to unmistakable sounds. My friend's and my sister's rooms were not far from each other. I crept up the stairs quietly. I hoped that what I was afraid of wouldn't happen, but I still longed for it somewhere. Through the keyhole I witnessed my friend fucking my sister in doggy style.
-Fuck, fuck Josh with that big cock
-Shh, I don't want your brother to hear us!
-And if he catches me, what will happen then?
-I don't want my best friend to find out....
-What, that you fucked his sister? That cripple won't find out anyway. Ohh Ohh yes, I think I'm about to have an orgasm, ahh I'm coming!!

They fell back into bed panting tiredly. Diana started for the door and I almost fell over. She walked happily towards her room with her naked body. You could see the milky white cum on her bottom. She stopped for a moment on the threshold and looked in my direction, as if she knew or suspected that I had seen the whole thing. But how would she know that I was there, was it a coincidence or not?

To be continued