I was lounging on the couch in the living room, scrolling through my phone looking at porn, when i heard the front door open and close. I glanced up as, Isabella, walked in. She was looking gorgeous as usual, a petite school girl, with long, dark hair and piercing green eyes. She wore her tight school uniform, a plaid skirt and a grey blouse, and my eyes were immediately drawn to the way her legs looked in that short blue skirt she wore.

I couldn't help but remember the times i had smelled her dirty knickers before, using them to wank my cock as i imagined what it would be like having her suck my cock and to blow my balls deep into her tiny, tight little asshole.

I had always tried to keep my dirty thoughts hidden from Isabella, but sometimes i thought she caught me staring at her ass in her school uniform, as I mentally undressed her. Most of the time I would have to go to the bathroom to relieve myself.

Isabella..

"Hey Nelly," she said, dropping her backpack by the door. "Is Alisha home?"

You..

"Nope, she's still at work."

Isabell..

"Oh," Isabella said, biting her lower lip. "I was hoping to talk to her about something."

You..

"What's up?" I asked, trying to sound casual.

Isabella..

Isabella hesitated for a moment before speaking. "Well, I had sex education class today and it got me thinking... I've never done it before and I'm feeling really horny. I was hoping Sarah might have some advice."

My cock went rock hard and veiny at the thought of Isabella, naked and begging for a cock. I could practically see the ache in her pussy, the need for a long, hard dick and a rough, dirty fucking.

You..

"Uh, I'm sure she would if she were here," I stammered, trying to keep my composure.

Isabella..

Isabella looked at me for a long moment before speaking. "Nelly, I know you want to fuck me. I always catch you staring at my ass in my school uniform. And today, I'm going to spread my legs for you."

I couldn't believe what i was hearing. The words coming out of Isabella's mouth were shocking, yet they sent a thrill down my spine. My cock was throbbing with need, my balls aching to empty themselves into Isabella's tight little asshole. I couldn't resist any longer as she took off her top and started to touch herself in front of me wearing nothing but a skirt and tight white panties. Her petite body was on display, and she knew exactly what she was doing to me. She ran her fingers over her flat stomach and up to her perky breasts, cupping them in her hands and teasing her nipples. I watched in amazement as she touched herself, her breathing becoming heavy and ragged.

Isabella..

"Do you like what you see?" she asked, her voice dripping with desire. "I know you do. I can see it in your eyes. You want me, don't you?"

I nodded, unable to speak. My throat was dry, and my mind was racing and the thought of taking Isabella's virginity was exciting and sordid.

Isabella..

"Good," she said, a wicked smile spreading across her face. "Then take me. Take me now, my pussy is so wet and ready for your big, hard dick, Daddy.”

You..

"Come here you sexy little tease," I  growled, pulling Isabella towards me.

She eagerly climbed onto my lap, rubbing her pussy against my hard cock. I could feel the heat coming off of her, the wetness seeping through her uniform and onto my pants.

I reached up, grabbing a handful of Isabella's hair and pulling her head back. I leaned in, kissing her hard and deep, my tongue exploring every inch of her mouth. She moaned, grinding her pussy against my cock even harder.

I reached down, grabbing the hem of her skirt and pulling it up. I groaned as i saw how wet and see through her panties were. Her pussy was shaved and glistening with wetness, the lips puffy and swollen with need. She was begging for a fucking.

I couldn't wait any longer. I reached down, undoing my pants and pulling out my cock. It was long and thick, the veins standing out on the shaft. Isabella eagerly climbed on top of me, guiding my cock into her wet, tight pussy.

I groaned as he felt her pussy wrap around my cock, the walls pulsing and contracting around me as I slipped into her virgin pussy. She rode me hard and fast, her breasts bouncing in her tight blouse. I couldn't believe how tight and perfect her ass was, the way it felt as i grabbed onto it and slammed her down onto my cock.

Isabella then led back on the sofa, spreading her legs as wide as she could, inviting me to cum deep inside of her.

Isabella moaned, burying her face in my neck. I could feel her teeth biting into my skin as she came all over my shaft, her pussy clenching and milking my cock. I couldn't hold back any longer, I came, filling her tight little cunt with my hot, sticky load. Isabella could feel me pulsing inside of her as i released. She smiled like a naughty slut, feeling a sense of satisfaction. It was her first time, but it wouldn't be her last.

Isabella pulled me on top of her, totally spent. I wrapped my arms around her as she rubbed her long fingernails up and down my ass crack, holding her close as we both caught our breath. I couldn't believe what had just happened, but i knew one thing for sure - I had just fucked my girlfriend's little sister, and i would do it again in a heartbeat.