I like it when kissing if a girl bites down on my lip, I can stand being bitten on the lip pretty hard as long as it doesn't draw blood. Little bites other places are okay too, as long as it's above the waist... Teeth and oral is never a good combination ladies, even if done really lightly, it's not pleasurable it just hurts!

I once had a girl handcuff me to the bed while giving me oral... that was intense, and the lack of freedom of mobility makes it kind of interesting, that's about as far as I'll go into bondage though.