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Growing up, my sister(Ally-21) and I(Jacob-24) had a ordinary relationship where we would get along but also argue like ordinary brothers/sisters would. Halfway through my senior year, I started exercising regularly and carried it into school. After I graduated, I moved back home but I didn’t want to lose my physique. I asked my parents for an “all-in-one” type of home gym for my graduation present where I could continually workout. I kept this machine in the garage as it was just a space for storage for my family.

I would usually workout 2-4 times a week depending on plans or holidays. Every now and then, Ally would like to workout with me. If Ally did, we sort of did our own thing as there was a space for free weight workout or machine type stuff. One time, Ally was working out with me, I glanced at her doing squats. When Ally went to squat, I saw how nice her ass was and it was so much hotter seeing her body glistening in sweat. This was the first time I noticed how hot my sister Ally was. As the days went by, it just got harder and harder to workout while Ally was working out as well. It was killing me inside knowing I couldn’t do anything because she was my sister. Ally would think I’m an absolute pervert and sick if she knew what I was thinking.

One weekend, my parents went away for the weekend to celebrate their anniversary. The day they left, Ally was already working out in the garage as I joined her. Ally was in the middle of her workout and as she was finishing up, Ally asked if her form on squats was good. As I looked intently as Ally did some reps and said it was good.
Ally was relieved and said, “that’s good to know. Well I’m done, I’ll see ya.” I didn’t have time to think about Ally as I was trying to get my workout done. Eventually, I did because Ally left after I finished my warmups.

When I got in after working out, I headed up the stairs to my room. When I crossed Ally’s room, I heard some moaning. I silently and slightly opened the door to Ally’s room where she was in her bed masterbating and writhing around. I instantly got hard as I pulled out my phone to try and get a small vid or some pics of Ally. I think Ally heard me because she stopped and looked at her door, she swung open the door asking, “why were you watching me?” Speechless I had no words, but Ally saw my boner as the expression on her face softened as she led me to her room.
I openly admitted to Ally saying, “okay. This is embarrassing, but for awhile, I’ve been wanting you. I noticed when you were doing squats and I just started checking you out more and more. You’re so hot.”
Ally smiled and said, “well, I noticed you checked out my ass. And sometimes when I see you workout with that exertive look on your face, it turns me on. I also love the smell of sweat after a workout. It’s a fetish I have.” Ally reached for my cock and pulled it out. Ally, to my surprise took a nice whiff of my cock and then sucked my cock. I guess she loved the smell because I heard her breathing harder through her nose. I then lifted Ally up, placed her on the bed, took her clothes off, spread her legs and ate her wet sweaty pussy. I don’t know what it was, but Ally was right or at least in my comment. The smell of that sweat between her legs was turning me on as I started using my tongue more vigorously. Ally wanted me to stop eating and begin fucking. “Oh please fuck me! I’m on birth control don’t worry, just fuck me!” Ally pleaded. I didn’t hesitate as I sunk my meat into her pussy and started fucking Ally like a beast. Ally was writhing her hips around, gripping my back/shoulders, and wailing out in pleasure. As I continued to fuck Ally, I rubbed her clit and she let out a final scream. Ally’s orgasm made her body shudder. Ally wanted to ride me as I laid on the bed. As Ally started to ride me moaning, I brought her body close to me and started thrusting up into her pussy. Ally was screaming out at this point making her approach a second climax as I was approaching mine. Ally screamed out, “Fuck yeah, keep going! Don’t stop! Cum inside my pussy!” I kept pumping until I shot my load deep into her pussy. As we were both exhausted and sweaty, Ally whispered, “I love this smell.” I just nodded my head and agreed.

We cuddled until we caught our breathe, enjoying the smell, we showered together and got cleaned up. When we fucked without working out, it was good, but when we fucked after working out, it was at all times amazing with multiple orgasms. Our parents didn’t suspect anything because they wondered the smell was just our must. Ally’s fetish of this “sweat” also became mine.

Fictional

NSFW: yes

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