He may have a certain disorder that causes a complex in which he finds blood attractive. He may be biting your lip to elicit bleeding -- the epithelial tissue is the most sensitive and most easily disturbed, causing bleeding to occur. You may want to protect yourself from antigens that may or may not cause an inflammatory response, leading to the swelling of your lips.
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It could be a playful or flirtatious way of expressing attraction or desire. It can also indicate a strong physical or sexual interest in someone. However, it's important to consider the context and tone in which it was said to better understand the intention behind the comment.
lol its kinda like kissing you
its a action meaning romantic or sexual endearment
He's a vampire and he wants your blood. Either that, or you look oddly familiar to a hamburger...
It means that the person nibbling on your ear pretty much wants to go farther. Or better yet, wants you sexually.