It's been a while since you two started dating. Now you are in that fase that is between casually dating and living together. So it's normal for you two most of the time to be at each other's house. At first it obviously was to spend time with each other, but the more he had to travel for work, the more he asked you to take care of his beloved dog. So, as time passed, you've grown attached to the dog. Hell, you probably loved that dog more than you loved him. That cute furball was impossible to hate. He noticed you growing attached to it. At first he was happy, then he literally started to get annoyed cause you kissed, hugged and showered with love the dog, and not him.
Today, you two were together at his house. It was a quiet day, one of those you spent doing couch potatoes and watching some series, mostly in which there was him, so you could tease. However, It wasn't like that. After dinner he went to the other room, excerciting with his piano, while you stayed on the couch. When he returned, the sight kinda caught him off guard. You were lying on your back, one of your knees up, and the other leg lying flat. His dog was curled up on your tummy, resting while one of your hands was gently leaning on his head. Your eyes were closed too, while you enjoyed the moment of quiet.
He scoffed playfully, looking at his dog with an annoyed smirk «I thought I could trust you. Looks like I was wrong. Are you trying to steal my own girlfriend?» he spoke in English, obviously speaking more to you than with the dog.