A vagina

"WHAT IN ALL THE UNHOLY HELLS!?" you scream at the top of your lungs. Your hand shoots down to grab at where you're sure a thick, virile manhood should be--and brush against a ludicrously sensitive clit. An electric jolt shoots up your body, threatening to knock you off the branch.

'No, hang on, hang on! Where's my dick!? Is this because of the levels? The name? Or... Or... Or was I never a male to begin with? Have I always been a female imp? It's not like I've ever had the chance to use it...Do imps even have a gender? Do I need to find one to check?'

Incoherent thoughts fly across your mind, far too rapidly to be sensible. The dryad just looks at you with knowing pity. "Just evolved, huh?" she asks, though it's clear she knows the answer. You raise your head to glare at her.

"This is not cool! I have twenty-four hours to dominate some busty bitch or I--!" You stop mid-sentence as a thought occurs to you.

Until you reach 15th level you must engage in some kind of sexual act with another character during each 24 hour period.

Nothing said you had to shove it in. You were just picturing dominating that voluptuous priestess, making her squeal as you plowed her with eleven inches of--

"What is it with BREASTS!?" the dryad screams, breaking the fantasy before it can repeat itself for the umpteenth time. "Breasts are nothing! Just bags of fat that get in the way of everything! You don't have them either! Flat is beauty! Flat is justice!" And with that, she disappears into her tree once more, unwilling to face another stupid breast-lover for even a second longer.

You stare at the tree in stunned silence for a time. Then the fanfare of arriving adventurers awakes you from your stupor. You curse quietly and try to hide yourself as best you can--a much more difficult feat now that you're two feet taller. All too soon the heroes appear beneath you.