Please note this is a work of fantasy.

Hello, welcome to my story, My name is Aiden I'm 21. Growing up, I'd always gotten along well with my younger sister Bethany, she recently turned 18 last week.

I've always seen myself as her protector a bit, I'm fairly small, some would even dare say scrawny at 5'6 tall and 130lbs. I have studied marshal arts since I was a small child, so despite my size, most knew not to mess with me, and especially not my sister.

My sister on the other hand, has always been a very large girl. At 6'1 and 340lbs, she has struggled with her weight and confidence her whole life. She's never had a boyfriend other than a guy who asked her out on a dare(don't worry, he was dealt with).

I realized fairly early on that I was attracted to larger women myself, I was never terribly promiscuous but recently came out of a long relationship where sex was a regular activity.

Fast forward to this week, we're both home for spring break, parents are gone on vacation. We discuss what we're going to do. Neither of us can really come up with anything but to lay around and watch movies.

We both love horror and decide we're going to watch "X" we've been both wanting to watch it and waiting for an opportunity to enjoy the movie without interruptions.

We sit on the couch and start our movie, as the sex scenes start to happen, I find myself becoming aroused. I glance over at Bethany and she looks so amazing. I can't help but appreciate her soft body.

I think to myself "cuddling would be okay, right?", I move closer to Bethany and feel my body sink into her softness. She looks over to give a knowing smile, enjoying the contact herself.

The contact with her sends a rush of blood into my cock, it's now hard as a diamond. I find that my hands have mindlessly began to explore her rolls. She pulls me even closer and without saying a word pulls her tank top up exposing her large, soft, white tummy.

I continue to explore and caress her as much of her body is exposed to me. She whispers to me "no one's ever touched me like this, it feels really good".

I reach down and begin stroking her thighs which are barely contained by her tiny shorts, she lets out a soft sigh of pleasure, I work my way closer to her pussy and stroke around her pussy which elicits a more pronounced sigh of pleasure as she begins to breathe harder.

I take this as a sign to do more, I rub her clit through her thin shorts, I can feel her warmth and wetness through the thin fabric. I increase my speed and pressure causing her belly to jiggle as I rub her pussy, she leans her head back and begins to whimper. I keep rubbing, knowing that she's about to cum.

After another few minutes of rubbing her, watching her soft body jiggle, she lets out a loud moan, followed by an "oh fuck!", I watch her belly jiggle as her muscles contract and spasm in orgasm.

She says to me, "Wow Aiden, I've never felt anything like that before!" At this point all of my blood has rushed from my brain to my cock, taking all 7 of my braincells with it. All I can respond with is "I love you sis".

At this point I'm rock hard and ask Bethany if she can help me out, she says she's not ready for sex, I look at her soft belly and ask if we can just cuddle.

We lay down on the couch, her soft belly pressed up against me, I'm in bliss at this point, she is the most beautiful woman I have ever seen. I feel the warmth of her belly against me, everything is great except my hard cock is getting a little painful in the shorts, so I pull it out.

Doing so puts it in a position where my cock is grinding it's sensitive underside against her pillow soft belly.

This feels amazing and I begin instinctively humping her soft belly, she whispers to me "is this working for you big bro?" I respond to her, "yes it feels amazing sis, can I keep going?" She responds and tells me to do what I need to do to achieve release.

I hold her giant body against my tiny frame with her massive tits almost suffocating my face and humped her beautiful belly for all it's worth. Within a few minutes I was shooting my seed all over her.

She asks me, "did you have fun?". I respond with that's the most fun I've ever had in my life!

Maybe there's more adventures to be had with Aiden and Bethany? Perhaps I will write a part 2 eventually ☺️