I was a healthy 18 year old young man, when I was asked by my friend’s mother to house sit for a week that summer. Their German Sheppard, Gulius, was their and needed to be taken care of. He was a big boy, and knew me well, and we would play in the yard each afternoon. One afternoon, after playing outside, we went into the kitchen so I could feed him, and give him his water. After I fixed the bowl for him, I set it on the floor, and started to rise. Gulius jumped up against me, and, as male dogs often do, started humping my leg. Initially, I was a little shocked. I patted his head, rubbed behind his ears, and thanked him for the gesture. Gulius did not want to get down. As I held him, I could see his penis had grown out of his sheath. It was huge! This fiery red, pointed cock was about seven or eight inches long, and as fat as mine. I couldn’t help but start to get turned on! I could feel my own cock getting hard in my cutoff shorts, straining to get out. I lowered Gulius onto the floor, and reached for his cock. It was slippery and wet, and he seemed to enjoy my stroking it. I coaxed Gulius onto his back, and rubbed his belly, which he loves. I then stroked his cock with my other hand, and lightly played with his rather large balls. By this time, my cock was rock hard, and I needed some relief. As I stroked Gulius’s cock with one hand, I undid the button and zipper on my cutoffs. As I stood to let them fall to the floor, Gulius went right for my cock, nuzzling under my balls, and licking my shaft with his broad, coarse tongue. After licking me for several minutes, I lay down on the kitchen floor, spread my legs wide, and started to masturbate. Gulius continued licking my balls with his tongue, and started to work his way down to my asshole. I was ready to explode. Gulius was licking my ass, and it felt so good! I again noticed his still hard cock, and knew that I needed to feel it inside me. I turned over onto my hands and knees, and Gulius instinctively knew what to do. Gulius jumped up with his forepaws on my back, his nails scratching my sides, but I didn’t care. I could feel Gulius inching his way forward until I could feel his cock thrusting at my rear end. His first several thrusts stabbed at my ass cheeks, and really hurt, and I realized that I needed to change my position. I pulled a chair over to rest my arms on, shifting my ass to make a better target for Gulius. Reaching around, I grasped Gulius’s hot cock. It felt larger and hotter than ever. It was throbbing in my hand, and Gulius was still trying to thrust it at me. I spread my legs a little wider, and guided his penis to my asshole. When Gulius felt the tip of his cock at my eager opening, he thrust his cock in about two inches into my ass. Gulius shifted slightly on his hind legs, and then thrust the rest of his shaft deep into my ass. We were both in ecstasy! Gulius began to fuck me fast and furiously, sawing his penis in and out of my ass, as I stroked mine. I couldn’t keep from coming much longer. I’d never even dreamed of doing anything like this before, and here I was…getting fucked by my friend’s dog! I exploded all over the floor and my hand, as Gulius made several final hard thrusts inside me. He withdrew his cock and lay down on the floor panting, as I rolled onto my back on the floor, still stroking my semi erect cock. I don’t know if Gulius came in my ass or not, but it was the most erotic, forbidden, taboo sexual experience of my life.