"I pick..." you say, hesitating.
It is a very big decision, after all. once you are transformed again, your mind shall alter itself as soon as your body will be transformed. So you better decide wisely indeed. So you are understandably taking a bit of time before saying your choice to the minotaur. Oh, it is hard but you are delighted to leave behind this female body that is so revolting to you.
"Yes?..." prompts you the minotaur.
"I want to be a dryad!" you exclaim, as it hits you as an obvious thing.
Of course! It is obvious! You want to be a dryad! You would love that!
"Are you sure...?" says the minotaur, most startled. "You... You are aware of what a dryad is, right?..."
"Naturally!" you say heartily, smiling wide and jumping up and down giddily.
"Because it is a nymph. A wood nymph. And if I recall your words of five minutes ago, you were adamant in not being a nymph. And now you desire being a dryad?..."
"Yes! Yes! Yes! I want to be one with nature! To give myself in the nude to the earth and grass and plan! To tend to them dutifully and lovingly! To be caressed by bees! To love the goddess Gaia herself with all my heart! To feel the seed of satyrs and centaurs like the earth feels the seeds of plants that are the very symbol of blissful divinity!..."
Yes, all those things sound simply divine. To feel your belly swell with new life itself and to love your sister nymphs just as much... To frolic in the fields and woods in an eternal spring and summer. To indulge in the wondrous fruits of the earth... To kiss satyrs and nymphs and satyrs and lost humans... You are taken away in delectable eagerness as you imagine your future life. Your happiness at becoming a dryad is so intense that you already are forgetting who you were before, a human male. The centaur sighs. Of course, you took too much time in deciding what you wanted to become, leaving your new desires and urges as a nymph take over your mind finally. Wanting to be a dryad merely was a result as what you as a nymph would have wanted. But there was nothing to be done and a dryad would be better for the world than another human male, after all. So the minotaur utters his powerful spell and you develop into the dryad you are so impatient and eager to become.