You're too sleepy to notice it at first, but you do feel a certain sensitivity you're not familiar with in your nipple area, and a kind of a dull throbbing pain all over your body. You begin to stir, but Diane gives you a slight squeeze.
"Don't worry, darling, I can help make this much less painful with my magic." She says. About that point the pain becomes piercing. Your bones feel like they're shattering.
"Yes, please!" you say through gritted teeth. She smiles and touches your forehead. The pain fades instantly. It even feels pleasant. You laugh indelicately as the changes tickle up and down your softening skin. You smile and cup your breasts as the inflate to a respectable size. You laugh hysterically as your body takes on a decidedly feminine shape and your hair seems to poof out rather suddenly, flopping down to your breasts in and the small of your back. Flowers begin sprouting in your hair as well their perfume is intoxicating.
You then gasp. You feel something between your legs part and a tingle of magic flows through the opening. It is a sensation wholly unfamiliar to you, but one that makes you cry out in unbridled pleasure in a voice unfamiliar to you. You lay there panting as the tingly sensations slowly fade.
You bolt upright. You look down at yourself. You're the picture of the perfect female. You back up as if you could crawl away from your own skin. You collide with the trunk of a tree and look up at Diane with a horrified expression.
"Oh now," she says crawling over to you and giving you a comforting embrace. "It's frightening at first, but you'll get used to it. You'll have all eternity." she says cooing
"E-eternity?" you ask.
"That's the cost of my help. Without accepting, your transformation would be painful, but much less permanent. Now you're ours forever." she smiles. One portion of you is horrified and wants to run away, but as the perfume from your hair continues to reach your nose, that portion slowly starts to fade.