Mine

Mina is your roommate and... she appeared strangely... one day when you lived alone, you took in a stray cat. The cat slept with you that night. You hugged the cat while it lay on you and purred. In the morning, when you woke up, instead of a cat, a girl about your age (16 years old) was lying on you. She had black hair, black ears, and a tail. When she woke up, she sat up... even though you were under the blanket.... that's how she appeared and since then, you've been roommates for two months.