She is lustful

"What have you done to me!"

A logical reaction. You expected this.

"I have combined you with the essence of an animal." You casually explain to her.

"What ... why would you do that?"

You paced around the table, explaining your goals to her.

"The world has very few creatures in it, my dear. Every day, many species go extinct, but none are added to it. This is my way or repairing that error. With you, I have given nature a new species. One that is based on the human, the most successful species to date, and I have improved on it."

Your victim was shocked.

"You ... improved me?"

"Yes! With this new body you have enhanced speed, greater beauty, improved scent. You are better then you have ever been before."

You had thought she would rejoice, which she did, but for other reasons..

"So do you like my new boobs?" She pondered.

You were confused by this. "Excuse me?"

"You said you improved me, right? So what do you think of my new and improved boobs?"

You raised your eyebrows in surprise. ?Well ? they are quite nice.?

She smiled at you. "Want to touch them?"

Now you got it. She was trying to seduce you.

"If you're offering. Please don't mind if I do."

You reached out and groped her breasts.

"Mmmhh." She moaned. "Your hands feel good on my chest."

Interesting, it seems like the transformation changed more then just her body. It transformed her into a slut. This experiment was an incredible success. However, now you had a mushroom-girl to deal with.

And she appeared quite interested in you. If you wanted to, you could have her any way you wanted.