Scarlet

You go in a pet store and you buy a cool looking white and pink female snake named Scarlet. You don’t know about her powers and it looks perfectly normal. She don’t even have fur like it’s true form but she’ll change the more days she stays in your home first she grows fur then she grows longer than the average human male then she gets extremely affectionate to you then she grows a human torso legs and arms then she will hypnotize you and, she might wraps you in it’s coils.