Two's a company
Three's a crowd

Three with a flea removes glee(happiness)
A desperate flee from the sea

Attention seeker, the flea
Serves all sorts of tea(wears many faces)
Just to make sure she gets all the "WEEE"(wee - attention/fun/etc)

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You probably won't understand from the 2nd stanza onwards, erm, i wrote this on impulse, so all ye pro literature people please don't flame me.