Me and my wife (Sara) live in an apartment with our dog. We have been married for about 2 years . I have a Great Dane dog. We call it Dane. For the people who don’t know much about dogs, its one of the large breed dogs. My wife is afraid of it’s size , even tho it’s totally friendly and has never harmed anyone. So she never goes near it. One week ago, we were having sex at night. We were totally naked. Sara was giving me a blowjob. Our dog was in the room too. Suddenly the dog (Dane) jumped on the bed and shook the whole bed,it came behind Sara and started humping her. Sara got scared. I could see her facial expressions. But I told her to keep sucking me. Dane got on her back from behind. Sara couldn’t bear its weight so she fell on me. I lifted her up from belly and held her there. At first I thought Dane was just playing because he’s a lovely dog. Then he started moving and there was this loud “Ahhhh” moan. Dane tried to pit its dick in Sara. Sara suddenly started moving forward to get out from under it. Dane got furious and barked loudly. He was trying to keep Sara under him. He tried to hold her in place with his legs. Sara got scared and stayed there like a scared kitten. Then there was another loud “Ahhhh”. Sara started breathing loudly. Her face turned red. Dane had put its whole dick inside her and started stroking. It was shaking whole bed. Sara just stayed there like “Haah… Uugh.. Aaah…”. She had stopped sucking me. I was laying naked under her and watching our dog wrecking her. She was looking like a goat under a camel under Dane. After some time Dane came inside her. Took it out and its cum started dripping out on me from Sara. Sara said” he fucked and you said its friendly”. I said did it cum. She said” A lot”. This got me hard. I hugged her and pushed my dick inside her. Damn she was full of cum and it was warm af. I started thrusting inside her. My whole dick was wet and slippery with my dogs cum inside my wife. I came so much in her. Probably the first time I had came that much. We went to sleep like that. In the morning we woke up and searched about wether we should take an action because Dane came inside Sara last night. But we found out there was nothing to worry about. I went to office. The next day I came early from the office. When I entered our room Sara was with Dane on our bed and she hand no pants and panties. I asked her what was happening but she said she came out of the shower and Dane started playing with her so she went with it. I got a little suspicious because she was wearing her shirt and was only naked from bottom but I ignored. After few days Dane started acting weird. It would often try to grab Sara at home and try to hump he. And often if Sara won’t bend, it would get dominant and try to force her by barking and attacking. At first I thought it was getting close to Sara but this was something else. Because mostly it’s dick would pop out while playing with Sara. One day when I got home. Sara was bent naked on sofa and Dane was completely inside her. She stood up immediately with surprised face and said “Nothing happened, we were just playing”. Then I saw cum came dripping out on her thighs all the way down to her legs. Dane had already came in her. She went to the washroom to clean. All her legs were wet with cum. At night in bed, she hugged me and said sorry, it won’t happen again. I asked how many times has it happened. She said since the night Dane fucked me on the bed. He does me daily few times a day.