Well me and my boyfriend decided to have sex at my house since my parents are away. We were doing foreplay on for a good 15 minutes..- I was giving him head while he was lying down with his eyes closed. Then all of sudden, my 6.5 ft tall, 290 lbs Great Dane came over and stuck his penis in my vagina from behind. It was the one of the worse experience ever. My Great Dane started humping me and I was just yelling. My BF was just sitting there shocked. He tried to move the dog but the dog would not