One day me and my girlfriend and I went to my house after school.

I did not take the time to greet my dog when I came in the door because we were too focused on other activities.

We went down to my room and started having sex on my bed. My bed is very low to the ground and before I knew it my dog ran down the hall extremely excited to see me home, and walked up behind me and licked my balls.

I felt very violated and could not continue but I never told my girlfriend why. I think she thought it was because of her but really it was just because my dog licked my balls.