DesertDom seems to understand the scenario the best
It was a relationship of a small powerless woman, the mouse, owned by a powerful woman, the cat
I submitted to her and feared her in our play
It was an imaginary game only but the interactions sometimes caused me to become very aroused

If someone were to play a mouse in this thread it would be imaginary play only

Incidently if you search DeviantArt Italy you will find this kind of play is very common

I attached a jpg of the type of drawings you would find on the deviant art site