Isaac hadn't had a clue how many nerve endings were in his lips, but when Derek's thumb made contact, he was suddenly sure it must be a hell of a lot. His cock twitched in response, and he squirmed in place.
"I would want whatever you want, Sir," he replied, knowing that it was a bit of a cop out answer, but it was also the truth.
"Just as long as you are involved. You've... you and other people, have called me pretty. I don't want to be a girl or anything, but something about it..."
He shivered at the thought, even though he still couldn't pin down what it was that made him so excited.