Here be dragons

A girl brought a egg in my house. It's bigger that my head with a rough, rocky shell. It's sitting on the kitchen table, in a ray of sunlight, as the girl argue with my sister. They are arguing about the girl character and attitude, my sister fed up with her. I know that this girl is messy and doesn't clean after herself, and is also quite selfish. I tend to agree with what my siter is saying, but want to avoid conflit so I don't join the discution.
As they talk the egg hatches and a slender creature, looking like a mix of a ferret and an serpent with short, pure white fur slithers out of it, using his small clawed paws to scales the walls of the room. It's cute despite its strange way of moving, and I hope my sister doesn't see it and freak out because it remind her of a lizard. The newborn pet doesn't have a very sure footing yet, so it loses its hold and falls on me. I catch it in my arms, its body is very hot and muscled, almost hard. It cuddles to me, pointy muzzle nipping at my neck with a happy, chittering sound. It then jump out of my arms to climbs on the counter. The girl stops arguing with my sister to touch is, and it's fur turn velvety black.