"W-Why are you looking like that?! You're such a bad owner that your cat wants to eat you!"

He hissed and bit you - as if he really wanted to eat you - and trying to hide his bright blush of embarrassment. He's so damn attached to you but he'll never say it, much less express it, even under the threat of death. Never! And yeah, that explains what happened. Overwhelmed with feelings, he found no other way to express them. That's why you woke up feeling soft and careful nibbles on your wrist.