One summer when I was sixteen we had a black lab named Rex. Me and Rex always when for walks together and one day while on a walk I found out about all the fun I had been missing with Rex.

We had walked down by the creek, one of my favorite places to walk lots of shade and still some sunny spots  that were secluded. Rex had always followed me every where since he was a puppy and slept in my bed with me. On vacation he had licked at my leg or but when I was getting dressed but nothing more. Well back to the story this day it was pretty hot so I decided to take a dip and cool off.

There was no one around so I slipped my clothes off and went into the stream. I was average built a 34c chest and not to bad hips and a neatly trimmed pussy with red hair on it. The water was about 2 ft. deep so I wasn't covered but sat down on a rock up to my tits in the water and was splashing water on the rest of me to cool me off. The water was pretty exhilarating and cold so my nipples got really hard. It was then that Rex decided to join me, splashing all over and playing keep away with a stick. We played for a few min. then I decided to get out and lay in the sun to dry.

Rex followed close behind me, and when I got to where I was going to lay I turned around and there was Rex. The only thing different was his dick was hanging out all pink and wet. I had seen it before when he licked him self but it seemed much bigger for some reason. Now just so you know I was no virgin me and a boy from school had had sex twice. I loved it! Not thinking I bent down to see if something was wrong with Rex. When I did he licked my still had nipple. WOW what a shock his hot tongue  hitting my cold nipple it was electric. and before I could do anything he licked it again and a shot of pure exticy shot through me.

So I figured it felt good I would just let him keep doing it while I made sure he was alright. I looked at his dick and I could see anything wrong other than it a peared to be swelled more inside him, I would find out later why. So I just decided to lay down and let Rex continue to lick my nipples. Besides it was feeling great. I layed down relaxed and spread out with my arms out to the side of me. Rex was busy prancing around from one nipple to the other when he realized he could reach both of them if he straddled my face. This left me pretty much staring at his dick in my face. I looked on in aw at the size of it. Well I thought to my self Rex was a big dog, all at once he stopped and walked away I was actually a little mad for him leaving me I was actually getting close to an orgasm from him licking my tits and had started rubbing my self and fingering my pussy. But before I new what hit me he was between my legs and licking like a fanatic at my pussy. I started to push him away but how it felt stopped me. It was fabulous! I moved my fingers and spread my legs alittle and man did he go to town, His tongue was rolling up inside of me to places my fingers couldn't reach and it sent me over the edge I came like crazy and he just kept licking my juices as they came out.

I got to thinking as I was cumming for the second time that if he was this good at this how good would he be at fucking me ? As I started cumming even harder I let out a low moan and arched my back up and then colapst from pleasure. He just wouldn't stop. So I tried to roll over and get up. this must have been what he was waiting on because when I hit my knees he leaped on me flaying his hip madly at my ass. Scared I froze and that was just enough time for him to find his mark. When he did he found it big time in one big shove I felt all of him go deep inside me and it felt pretty good.

Then he started pumping me really hard and fast and I was getting the feeling this wasn't a bad Idea after all. then I noticed that there was something hitting my pussy that was bigger. and with in 2 thrust he pushed it in me. My god the pain shot through me as he still pumped away wildly tried to pull away but couldn't. then the pain stated to subside but I was still swear there was something else going on. His dick hadn't been that big before but it was now growing inside me and I could feel it pressing on my cervix. The ball he pushed into me was growing in size to and it felt like I was completely full.

Then it happened I don't know if it was from hitting my G spot with his ball or just the shear thought of what was happening but I had the mother of all orgasms. While Rex just pounded away at me. then suddenly he stopped and I could feel him twitch inside me and felt jets of molten lava fly out of him and this sent me off again. Rex lay-ed on top of me for what seemed a long while while I was catching my breath. Then all at once he turn around some how and we were but to but and he was pulling away from me but he was stuck. From him pulling I started to go again, and my pore little pussy felt like it was being puled off of me. Finally he popped out of me with what sounded like pulling a boot out of the mud quick, and cum started running down both my legs. I reach back and felt my pussy, it was gaped open like a big hole. Rex was off cleaning what I know could see to be the biggest dick I had ever seen in my life.

I found out at a latter time that it was 8" long and that didn't include the ball on it and the ball was as big as a tennis ball around. I picked my self up and went down to the creek and washed off, all the time thinking to my self, WHAT COULD ME AND REX DO ON OUR NEXT WALK??????