Bull makes a fake little growl at the nip, playful and eager at that. Then the ropes tighten some more and his breath catches before a smile tug at the corners of his mouth. He breathes into it for a moment, relaxing a little more with each exhale.

"Keep doing that and I'll be calling you that a lot more often, sir." And he means it. Giving up control like this, giving it to someone you trust is something Bull hasn't done much and it is intoxicating when he gets to do it. He shifts against the ropes, wishing he could reach out and pull Bobo in for another kiss.