evolution

I was going to attempt to reply to your comment, but I'm at a loss for words... Good work!

The bite was technically on purpose... I bit my lip while making a face at a friend of mine. Guess I bit down harder than I thought.

I've now developed a fondness for biting the spot... I just can't resist.

As for being sado-masochistic, wouldn't you agree that everyone is sado-masochistic, or alternately masochistic, to some extent?