Junkyard dog

I took a job working at a 24hr. junkyard,they wanted me to work the night shift,they said they had a watch dog that lived on the yard but he was a gentle giant, I love big dogs, so I was excited about meeting him,I came in early, it was hot!, so I wore cut off jeans and t shirt, the boss showed me what to do,he said lets meet Pete,we went out side and he called for him,I heard some noise and out came this monster of a dog, shit! His is as big as a pony, he walk over to the boss and lean up against him,he had to take a side step to keep from being knocked over.
He said Pete meet your new playmate. He looked up at me with slober coming out both of his cheeks, his the biggest Mastiff I've ever seen, Pete came over to me and stuck his big droopy nose right in my crouch and snorted, the boss laughed and said he likes you.
Boss said that's it I'll leave you two too your work,he left, we locked the gate, I started to go to the office, Pete stood between me and the office like no you come with me, so I did, I followed him all through the yard, we ended up at a clearing that had dog toys all around ,a bus that had no wheels and a ramp at the back door, he went up the ramp and stopped turn to look at me like are you coming? I was hesitant at first, he snorted and went in, I followed, Pete was laying on his side licking the biggest dog cock that I had ever seen, I sit down watching him, my cock starts getting hard, I pull it out, he looks at me and come towards me, his big tongue start at my nuts and goes all the way to the tip, slober all over it, he turns side ways to me and stands there, his cock head is still out, he looks at me like well! So I return the favor, I stand up and pulled my shorts off, Pete sticks his big nose deep between my ass ckeeks and licks from my nut shack to the top of my crack, he starts licking me, I get down on all fours so he can get at my butt hole better, his tongue loosen me up, his big tongue goes deep inside me, I moan, he starts tongue fucking me,his good, I'm rock hard now and leaking come.I look around at him,his cock is getting hard and more of it is coming out of his sheath, it's so bigggg!!!
He stops leaking me and positions himself behind me, he mounts me, it's all I can do to hold his weight, his forelegs wrap around my hips, he pulls me tight against him, the tip is hitting all over my ass cheeks, then he hits my lips and stops there, he pushes against them ,he knows that's the right spot, him rams into me,I scream,so much pain, his hammering into me,his cock is so hot,the pain subsides, he continues fucking me hard and fast, I feel his knot at my lips, he stops with it at my lips, like are you ready? He pulls almost out rams it all the way in, the knot slams into me, I can't breath, it starts swelling inside me, it pules and gets bigger, each pulse fills hot and exspanded my insides,I feel his hot come exploding in my hole, he hoops off of me and we're butt to butt now, this goes on for about 30mins,his getting smaller now, he pulls hard away from me and it pops out of me, I lay there leaking his come out of me, can't move, he lays down beside me, we fall asleep, I'm awakened by my boss, I'm naked, dirty,I say I'm sorry I'll leave and won't come back, He laughs and says you better come back, if you don't I'll never find anyone else for Pete to fuck. So now I'm Pete's bitch and I make money doing it