I'm not at all sure this is the one you mean, but try "Dark Revelation" by Tank Wilson.
PJ
"You told me you weren't like other men," she said, shaking her head at him when the storm of laughter had passed.
He grinned at her - a goofy, Clark Kent kind of a grin. "I have a gift for understatement."
"You can say that again," she told him.
"I have a...."
"Oh, shut up."
--Stardust, Caroline K
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