Don't worry, you can stop reading into this. There's nothing to this. Some guys just like to add either bites or full light nibbles when they kiss a girl. It's really nothing to think about. It's just his way of making out and kissing your body. He's just showing his affection. In fact some girls really like the biting. Though if you're not one of those people who likes it, I would suggest explaining that to him, and asking him to stop doing that.
Anyway, no, there's no signs, signals, or hints he's trying to give you. So you have nothing to worry about here. It's just him being playful.