He was gentle yes, but he was also thinking partially of his own needs. So it was a different type of gentle than say the touch he used for Kira. It was needy and selfish. Something he wasn't particularly used too. Something he often refused. But just once he gave in, and look what happened. Look at the train wreck he started.
Kira was the last thing on his mind while he kissed her. The only thing he thought about was the pure satisfaction he got from her touch. From her reactions. "No...don't, just.." He was confused.
He looked at her with a mixture of emotion. Charlie was his nightmare, and here he was kissing her. Charlie was everything darkness was made of and he was becoming it, giving into it and wanting more.
"No." He stood and could hardly even look back. He got out, and quick and that was just about as much as his mind could handle. Next it was a cold shower and off to Kira's. How would he face her?..