He was starting to suspect. Hmm...perhaps she could make him think the double entendre was alien to ponykind for a few minutes at least.

"Oh, I know: popsicles!" She clapped her hooves together. "I love popsicles! Like how you have to lick up the drops as they start melting and suck on the ends! Maybe even give them a little nibble! They're really great on a warm summer evening while watching Princess Celestia lower the sun and Princess Luna raise the moon!"