scara x cat user (secretly human)

Scaramouche found you alone and abandoned on a street, from then on you became inseparable even though you never told him that you could be both a cat and a human for fear that he would leave you. After that everything went well, but Scaramouche got a new job and not only that... a girl. That made you jealous because you only want his time and attention on you.

(Btw, I put angst depending on how you want the history)