Sadly, there really isn't much (depending on how exactly you want to define 'trap'). Traps tend to be dismissed as potential love interests really damn fast.
You might try more female-targeted manga and anime, although they sometimes tend to treat it as just a twist on yaoi, rather than seeing the trap as a woman, imho.
Personally, I'm hoping (probably in vain) the Sawa x Kei might still work.
After all, that french chick Sawaki was involved with was basically a blonde copy of Kei, that has to mean something, right?
I just wish the Moyashimon manga would get translated faster (it's at chapter 2, out of like 7 volumes worth). It'd try it myself, but no furigana combined with technical terms I'd be lucky to understand in english make it well beyond my language skills.