Was in my sister's room. We were similar in size, and I had been crossdressing in her clothes secretly for a long time. I was fully dressed in her clothes that day which included a short skirt, thong panties, her socks, and heels. I got down on all fours to get something out from under her bed and her horny male dog mounted me gripped me tightly and started jerking. I was unaware about dog mating and didn't see her dog in a sexual way at all, so didn't realize what he was doing until something poked inside my asshole and started fucking me hard. I was shocked because nothing like this had ever happened to me before. I had only used my sister's tampons anally a few times and compared to her cold plastic tampon applicator, he was wet and warm. I had only seen him hump things for a short time then stop after losing interest and I thought he looked funny doing it. He wasn't gentle, but what he was doing felt good to me and he had a tight grip, so I let him keep going. When he finally did stop and loosened his grip on me, I felt full, but thought he was done. Instead of getting off of me and heading off somewhere, he just stepped off of my back and turned away from me. I felt something turning inside me when he did. We were now butt to butt and he was stuck inside of me with what I later found out was the knot. He whined softly and started coming in me. I tried to push him out out me, but he was stuck in me. I tried to move us, but he wasn't wanting to move. If that day had been like most other days, we would have remained undiscovered, but that day the worst happened. I heard a door open and realized someone was home. I panicked and tried pushing him out again, but he was still stuck in me. My sister went right to her room and finds her little brother not only wearing her clothes without her permission, but also on all fours stuck to her male dog. I felt so humiliated and knew it looked bad. She was mad at me wearing her clothes and was mad about what I had done with her dog. She thought I must have wanted to get fucked and had dressed up in her clothes and then pulled her dog up on my back and forced him to fuck me somehow in what must have been one of many times. I apologized for wearing her clothes without permission and let her know exactly what happened with her dog and that he was the one that had mounted me, this was the first time it had happened and I hadn't planned or wanted it to happen, and begged her not to tell anyone. Luckily she didn't panic and phone emergency services. She calmed down and stayed with me till he was finished asking lots of questions I wasn't comfortable answering, but felt I had to answer, because of the circumstances and was scared what might have happened if I didn't answer. I told her everything about my preferring wearing girl's clothes and why I didn't stop her dog. Don't know if it was a combination of his knot, him coming in me, his penis and knot pulsing and throbbing inside me, or what it was, but it was making me feel really good. Finally it felt like my insides were contracting on their own and in spite of everything that was happening, made me feel wonderful and I let out a little moan. My sister heard that and asked about it, so I did my best to explain what had happened. She seemed surprised and maybe a little amused by it. When he finally did pull out, she made sure I was okay, had me undress out of her clothes and get cleaned up. I saw her dog's penis which looked big and knew it must have been a lot bigger when it was inside me. I felt a little sore and nasty from what had happened and thought I would never want it to happen again, but I couldn't deny that good feeling I had gotten from it. It was over, but I was scared that she would tell everyone. She never told anyone about what happened with her dog and kept my crossdressing secret even giving me some of her old clothes to keep. I felt sick about getting caught crossdressing and worse knotted to her dog. I couldn't blame the dog, but I did blame myself for what I was wearing that allowed him easy access, being in a position he must have saw as willing to mate, and not stopping him. I never looked at her dog the same after that and caught myself staring at his maleness and the remembering that good feeling I had gotten was on my mind a lot. I didn't think it would ever happen again, but that was not the last time dog fucked me. I felt like I had little control of what was happening and was totally hooked on dog sex. I tried to make sure we were always behind a locked door. I found that if I pulled up my skirt and pulled my panties down enough, he would lick my asshole before mounting me, which felt very good. I don't know if my sister realized that her dog was fucking me almost daily, but she didn't say anything.
he was used to do it, especially in your sis clothes.id like to contact you more.
