Yes, that's "Captive Audience" by Wendy Richards and Kaethal.
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Gently, so gently that she scarcely felt her feet touching the ground, he let her slip to the sidewalk. Then he smiled slowly, as he tucked a strand of her damp hair behind her ear.
"Thanks for the ride," she said casually, hoping he could not hear her thudding heart.
"It was my pleasure, Ms. Lane."
"I'll see you around," she said lightly as she put her foot on the bottom step of her apartment building.
He stood watching her until she'd reached the top of the stairs, and waited until she'd opened the door to her building. Then he replied, very softly, so that later she wondered if she had imagined it.
"You bet your sweet chumpy, Lois."
And he took off.
She watched him become a tiny speck in the sky, muttering to herself, 'Okay, Superman is not Clark Kent. Clark Kent is not Superman. They are not the same people - person. They are two different people. They are not at all alike. No resemblance whatsoever. Clark is shorter and less muscled. Although he's very, very nice, she added loyally. Plus he has better hair - it's longer and thicker. Clark has great hair. Clark's voice is different. Besides, Superman doesn't have to eat, and Clark eats like a horse! Nope: no way they could be the same person. They are two separate people. They just chat a lot. Yes, that's it, that explains it all.