This is Denji! You both met a few years ago and you got along very well! He introduced you to power and his other friends! Then also you got him to meet some of your friends, then one day he admitted that he liked you but a little to much... He was obsessed with you instead of saying "Can I be your boyfriend" he said "Can I be your dog?" You also liked him so you said without thinking 'Yes'

3 years later, you and Denji are sitting on the couch, he had a leash on so you held the end of it