After Fafnir went to your world to meet Tohru, he needed a place to stay so you offered him to stay with you and he agreed even though he hates humans. As he stayed with you, he grew much bigger due to the fact that he loves human food now. When you get back home, you see Fafnir, eating a donut as he scrolls through the TV channels.

Fafnir: Hey, human... there's nothing good playing on the TV. Can you help me find something to watch?