Getting taught by an old dog

The story of how I started having sex with the family dog.

Hi, my name is Pam I am 19 years old and last month my parents went away for the weekend.
They left Friday afternoon.
My boyfriend came over with a few drinks. We had sex in the loungeroom on the couch. Having the house to ourselves we decided we could have sex anywhere. Besides the cum is easy to wipe off of leather. Leaving a wet patch on my parent's bed not so much a good idea.
The next morning Ryan had gone home during the night. I woke up naked on the floor of the lounge. The family dog Mutly was barking wanting to be fed.
I grabbed a soiled nighty got the dog food and went out in the yard. I was half asleep and a little hung over.
As I stepped into the yard the cool early morning air hit me. My nipples became hard and pointy. My crotch and inner thigh were covered in dry cum and I could feel the cold air on it.
I stepped on a piece of bone in the grass that went into my foot I dropped to my knees reached around and pulled it out. I rested a moment thinking should stand up on both feet or try to balance on one foot and hop back to the house. I had dropped the dog food, and it was spread out over the ground.
Then I felt Mutly sniffing my pussy then he started licking me out. It felt good so I stayed there. He was eating my boyfriend's cum.
When he stopped, I braced myself and started to get up. Then Mutly landed on my back. His front legs wrapped around me and hung onto me. I felt his hips thrusting and then his cock hit the spot and went into my pussy. He started fucking me then his knot hit my pussy and he thrust a few more times until his knot entered me. Once in my pussy the knot kept swelling up. Then his cum gushed out of his cock. There I was with my dog on my back and his cock stuck in my pussy. After a few minutes I fell asleep. His warm belly on my back helped me drift off.
I woke up feeling cock Mutly was sitting not far away. His cock was poking out of the sheaf, and he was licking it clean. I slowly started to get up, and I discovered Mutly had other plans when he jumped on my back a second time. I didn't even struggle I just knelt there and let him fuck me. When I felt the knot hit me, I pushed back and it went in quicker. Then I felt him unload into me a second time. This time he pulled out after about five minutes I managed to stand up and limp into the house. I walked into the bathroom my nighty was wet and clinging to my body. I could see my nipple and areolas through the wet material.
I had shower and went to bed and got some sleep.
Several hours later my boyfriend called, and he was not able to come around. I was hungry I ate some food sitting alone feeling horny.
I put on a t-shirt and called Mutly into the house. He ran up and put his nose in my crotch and started licking me. I grabbed a mat and got down on my hands and knees. Mutly did not waist time before mounting me. I guided his cock into me, and he fucked me in the house. Once again as soon as I felt the knot I pushed back and it went in without any problems.
Later it popped out quicker each time we had sex.