No, I didn't enjoy having an audience. Home alone, I was fully crossdressed in my sisters clothes in her room and had gotten down on all fours to get something out from under her bed when her horny male dog mounted me, gripped me hard, and started jerking. I had never had sex before, had no interest in him in sexual way and knew nothing about dog sex or about them having a knot. I didn't know what I was in for. The short skirt and thong panties I was wearing gave no protection and he was able to get inside my asshole and started fucking me hard. I was shocked at what was happening and didn't move at first. He only seemed to hump things for a bit then stop and head off somewhere and what he was doing felt good to me, so I stayed still and let him keep doing it. When he finally stopped and released his grip, my asshole felt full, but I thought he was done and going to dismount. I found out how wrong I was when he slowly stepped off my back and turned away from me, and I felt his something turning inside me as he did. We were ass to ass stuck together with his cock still inside me. When I tried to push his cock out of me, it wouldn't come out. Tried to move us out of her room into another room and lock the door, but he wasn't going with me. Didn't know why he was stuck, how long we'd be stuck together, but hoped it would be soon after he finished coming. Most other days, no one would have ever known what happened to me, but that day I heard a door opening and realized someone was home early. I tried to push him out of me again, but he was still stuck. It was my sister and she went immediately to her room and found me dressed in her clothes without her permission and stuck to her male dog in the role of his bitch. I knew it looked bad. I was so embarrassed and humiliated. My crossdressing secret was out as well as what looked like much worse. She was mad and assumed the worst at first that I had wanted sex and got dressed and then somehow forced her dog to fuck me. I begged her not to tell anyone, apologized for wearing her clothes without asking, and explained that it wasn't what it looked like and what had really happened. She had lots of questions I felt like I had no choice but to answer. She explained about male dogs having a lump on their cock that expands once inside his bitch. My insides had been responding to his cock inside me pulsing, his coming, movements, etc... and then started contracting on their own giving me good feeling from it, causing me to make a noise and more questions from her. She stayed with me till he was finished and after he pulled out and made sure I was okay. She had me go get cleaned up. I lived in fear that she would tell everyone what happened, but she never told anyone what happened that day. She ended up being okay with me wearing her clothes as long as I had her permission first and gave me some of her old clothes to have. That first time, I hadn't been wanting sex, never wanted an audience, didn't feel comfortable with the audience, and would have preferred to remain alone. I blamed myself for being in a position to get mounted, what I was wearing that allowed him access, not stopping him sooner, not knowing more about dogs, etc. I didn't think it would happen again, but every time after that when he fucked me I made sure it was behind a locked door, I always wanted to be alone and never wanted an audience.