My first sexual experience was with a dog. I was 14 at the time. I am a guy, but felt more feminine and dressed up in my sister's clothes when no one was around. I had seen part of a porno with the woman on all fours getting screwed in a doggy position. I wondered what it would be like to get screwed, but didn't want it getting around the school that I was different.

So I acted out that scene alone several times with me as the woman on all fours and wearing my sister's clothes and her tampon slowly moving inside and finally plunging inside me.

A few day's later, I noticed a dog hanging around. It was very friendly, but had no collar. Someone had left it. I also noticed it was a male dog that hadn't been fixed.

I snuck him up to my room. I quickly dressed in my sister's clothes and got on all fours and pulled the skirt up to reveal my panties. The dog seemed to know what I wanted and mounted me and started thrusting. I moved the panties out of the way and his prick found my asshole and nature took over.

I looked over in the mirror to watch the action. The dog was thrusting hard. I could feel his prick moving in and out as he fucked me. I know why that woman seemed to be enjoying getting fucked in the porno. It felt wonderful.

Soon he stopped fucking me and laid on my back for a bit. He then shifted his weight and stepped off my back. I felt something inside turning when he did. He had knotted with me.

He soon was coming in me trying to get me pregnant, while I enjoyed his knot pulsing. When he was done and had pulled out, I put in a tampon and planned for our next mating.