The story of mine is a very long one so I will skip to the short version. My GF at the time discovered one of my secrets. Im a submissive and she found panties that wernt hers. She got assertive with me once and it instantly aroused me and she knew. From then on she was the dominant and I was the sub. Im not sure what led up to this moment, I can only imagine she must have seen something on my computer. Because we were having a "session" and she had one of those pillows with shackles on them that force your ass up into the air. She had me locked down and used a dildo on my ass for a little bit then just walked away without a word. about 5 min went by and she was back but I couldnt see her but I knew she brought her dog in. I could hear his nails on the floor. She got him on the bed and the first thing I felt was his tongue burried inside my ass and he quickly started mounting. She had to guide him and I was twisting and pretending to be grossed out by it but when he slid home the moan I let out betrayed me. THe names she was calling me while that dog fucked me I cant explain it. I loved it all. and from then on whenever we were home I wasnt allowed to wear pants and I had to submit to him whenever he wanted. She used to make me walk on my hands and knees for him. I miss that relationship ever day. This wasnt my first time be knotted but was the best time of my life.