He loved knowing she was being driven so crazy and he was the one doing it.
As he grew closer to his own climax, however, he worried about something. He didn't really want to just...blow his load all over her. And he could use a kleenex, but that wasn't all that nice.
He took his hand off of himself reluctantly, because he felt like there was a better way to go about this. He didn't stop kissing her breast until he lifted his head to say, "I have ulterior motives now."