Yes it's one of the Strangers series but I forget which one.
Strangers Strangers II: Becoming Partners Strangers III: When Two Hearts Collide Strangers IV: Tender Mercies Strangers V: Kissing Friends All by MissyG. I'll ask her if I see her which one it is. I think it's one of the later ones because I think I beta'd it and I started betaing on 2 or 3.
She meets Clark as a 'man in black' and then he becomes Superman sometime after that. She does know Clark as Clark. I forget when she figures out her friend Kal is her friend Clark.
HTH
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Carol
Edit - I THINK it's 3 because I'm almost sure there's K involved somehow and that's in the description for III...
