I (20M) had sex with my girlfriend’s (20F) sister (18F) at a music festival

The festival had been going exactly as planned. We’d set up camp close to Louisa (18F) and her friends, partly because I’d been asked to keep an eye on her, and partly because my mates had immediately taken an “interest” in some of her friends. They were more than happy with the arrangement as we helped carry their alcohol from the car to camp.

During the actual days everyone did their own thing though. We’d disappear into the crowds, occasionally see them all back at the tent to top up on alcohol levels, then head off again into the evening.

It was just before the headline act when I went looking for some food and unexpectedly ran into Louisa. She looked slightly flustered having lost all of her friends and being unable to contact them. There’s like 100k people at the festival, so WhatsApp and texts just doesn’t go through until hours later.

I got my food and waited for my mates with Louisa at a pre-agreed meeting spot. The main stage was filling up quickly, so we gave up after a while and decided to watch the headline act together.

We make our way into the crowd, simultaneously trying get as close to the front as possible and look for either of our friendship groups. We soon got as far as we could go, although disappointing still a fair distance from the front. There was a loud group of shirtless boys near us who had either drunk too much or taken something they weren’t meant to.

Louisa glanced over her shoulder at them, and then turned to me:

“Can you pretend we’re together?”

“What?”

“So random guys stop trying to flirt with me.”

I nodded and she quickly twerked her arse in front of my crotch. I wrapped my arms around her waist, and suddenly the distance between us felt very different.

The music soon started.

For a while, neither of us said anything. We simply stood there together, swaying with the crowd. I soon got a boner, but couldn’t move because of how tight the crowd was.

“I’m sorry, I can’t help it.

“I won’t tell Vick (her sister) if you don’t”. With that she began to rub her arse against my erect cock. The hands around her waist slowly moved to start playing with her underwear, and then eventually I had a hand in her pants.

The song ends, and in the momentarily pitch black she turned her head up and around towards me. I craned my neck as far as I could, but could reach to kiss her cheek.

The lights of stage illuminate again, and I can see her flirtatious smile.

Louisa turns her body in the tight gap to face me, she takes my face gently in her hands and pulls herself to me. Our lips met, the noise of the festival seemed to fade.

What started as a tentative kiss quickly became something neither of us seemed particularly interested in stopping. When we finally pulled apart, we looked at each other for a second, both slightly breathless.

“Maybe everyone is back at the tents ,” I whispered. We didn’t need to discuss it any further ; we both knew the reasoning was a lie, we were both aware what we really planned to do on a return to an empty camp.

We made our way through the crowd, barely able to keep our hands off each other. Every few steps one of us would pull the other closer, stealing another kiss or touching a sensitive area before continuing towards the campsite.

By the time we reached the empty tents, the atmosphere between us had become almost unbearable. “Let’s wait in mine until everyone comes back” she said as she was halfway inside the tent ensuring to show off her beautiful arse on her way in.

I led on her friend’s sleeping bag, while Louisa laid on her’s. There was a brief pause as we stared at each other; lust clouded my brain and I was unsure how best to progress the situation. Eventually I decided that action is better than words.

I slowly pull down the strap of this green bra/bikini thing she had been wearing. It reveal a firm midsize pale breast surrounded by a brown tan, I lean over and suck on her breast. Louisa inhales and starts to play with my short hair, “obviously no hickies Sebastian” Louisa tells me.

My left hand pulls down her underwear enough for me to run my thumb down her recently shaved vagina (you know how it goes when it was shaved 2-3 days ago, so it starting to be slightly stubbly).

A few minutes of this go by before it dawns on me I don’t have any condoms. “You didn’t happen to bring any protection with you?”, she shakes her head. “I’ve been taking the pill in advance of coming here”.

My fingers penetrate her vagina, the walls of her vagina tighten. Louisa hand stick her hand down my boxers, and grabs my erect penis. She tries to give me a hand job but there’s too little space to work with. “Not so fast, we’ve got time” I tell her.

I stop fingering her, and remove my shorts and underwear. Louisa does likewise with - god her breast looked incredible.

She climb on top of me and slowly inserted my penis into her, we both gasped her hip sink for the first time (she was very tight) and she begun to ride me. I hadn’t quite realised that when she goes up, her head was hitting the top of the tent route so I suggested we go into missionary.

I climb ontop of her, she again guides me in as I watch the parting of her pussy’s lips. I start with a slow penetration and tell her how beautiful she is as my hands fondle her tan lined boobs.

I don’t know why but I begun to ask her dirty questions; had she thought about me before (she had fingers herself a couple of times to me), when did she start, was this a premeditated fuck (not exactly, but she saw her opportunity with the fake couple line).

I was close (thankfully she was too) and semi-checked that she was okay with me finishing inside of her (which she was!).

A few minutes later her vagina tightens around my penis, Louisa is panting away like a Latin drumbeat. My dick suddenly releases a shit tonne of seaman inside her.

I linger inside her for a moment: the music still echoing somewhere in the distance and the adrenaline of what had just happened all seemed to blur together. 10 minutes later we’re dressed again and heading back into the festival for the late evening entertainment. We encountered her friends queuing for a silent disco, and while everyone was listening to the music through their headphones - Louisa removed me to tell me she still had my cum leaking out of her.

Nothing else happened at the festival, although I did drive her back home and after dropping off my friend, we did swing by my house that I nines would be empty and had round 2 in a more spacious environment.