Thanks everyone for those who showed love to my previous posts about my mom.

I've been getting a lots of request to post more stories regarding my family.

Just a quick introduction. I (19M) am raised in a nudist family consisting of Dad(46) , mom (46) , elder sis (23) and younger sis(18). I have already mentioned about my sexual beginnings in previous AMAs. Those wanting to know can talk to me personally as I can't post it in Reddit .

This story however, is little exaggerated to engage the readers.

One of the most exciting parts about being a home nudist was the sheer unpredictability of it. It wasn’t so much that my younger sister and I were always parading around without clothes on, but more that we were always prepared for the possibility of it. As a result, it became our norm, and that normality opened up a whole new world of experiences for the two of us.

I am 19 and my younger sister is 18. We are always been close, so it wasn’t entirely surprising that our relationship would take a turn towards the sexual, but what was surprising was just how sexually compatible we were. We’d fuck each other senseless whenever the opportunity arose, and we’d done it so often that we’d become adept at sneaking in a quickie whenever we wanted.

And that’s exactly what we were doing when we got caught by our Indian professor at the University. We were in the girls washroom, my cock buried deep inside my sister’s tight little pussy as she rode me furiously. She was moaning and grinding on top of me, her perfect tits bouncing in my face as she fucked me. It was so fucking hot, and I was just about to cum when we heard the door to the washroom open.

I've been close to Mrs. Professor academically. She used to teach me a couple of Indian languages and History even though thats not her subject. And I couldn't stop learning my Indian heritage from her.

My sister didn’t miss a beat. She just kept riding me, her eyes locked on mine as she dared me to cum. I could see the challenge in her eyes, and I knew that she wanted me to fill her up with my cum. But I also knew that we had to be careful. Our professor knew that we were siblings, and I didn’t want her to think that we were fucking each other in the girls washroom.

So I did the only thing I could think of. I reached up and covered my sister’s mouth with my hand, muffling her moans as I started to fuck her harder. She got the message and started to ride me even faster, her eyes wide with excitement as she felt my cock swell inside her.

I could feel my orgasm building, my balls tightening as I prepared to fill my sister’s pussy with my cum. But just as I was about to cum, I felt a presence behind me. I looked over my shoulder and saw our professor standing there, watching us with a mixture of shock and fascination.

I couldn’t believe it. We’d been caught, and there was no way to deny what we were doing. But instead of being angry, our professor just smiled at us and said, “ I didn't know you both were this close. Carry on quickly. I’ll just wait outside.”

I knew we were in trouble. I also knew that Mrs. Professor wouldn't make a big issue, as I've known her all this time. It gave a litte confidence.

But she didn't step out. Instead stood there watching.

My sister’s eyes lit up with excitement, and she started to ride me even harder. I could feel her pussy clenching around my cock, milking me for all I was worth as she fucked me. I couldn’t believe it. We were having sex in the girls washroom at University, and our professor was watching us.

It was so fucking hot, and I couldn’t hold back any longer. I felt my orgasm crash over me, my cock pulsing as I filled my sister’s pussy with my cum. She moaned and ground on top of me, her own orgasm ripping through her as she felt me cum inside her.

We were both panting and sweaty when we finally finished, our bodies spent and exhausted. Our professor clapped slowly, a wicked smile on her face as she said, “Well done, you two. That was quite the show.”

My sister and I exchanged a look, our hearts still racing from the intensity of our orgasms. We both knew that we’d just had the most exciting sexual experience of our lives, and we couldn’t wait to do it again.