He was grinning while fingering me?

My guy was fingering me last night, and of course I was whirling like crazy from his fingers. And when I glanced at him for a second, I noticed that he was kinda smiling/grinning.
Was it because he liked seeing me go all crazy because of him, or is it because I look funny and have funny face expressions? :(
He was grinning while fingering me?
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