She is naive

"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 enhances speed, greater stamina, improved hearing. You are better then you have ever been before."

You had thought she would rejoice, but instead she started crying.

"Aww, that is so sweet of you." She complemented.

You were confused by her words. "Excuse me?"

"You are trying to give something back to nature. That is a very admirable quality."

You were honestly pleasantly surprised by this turn of events. "Well thank you."

"Not at all." She responded with a smile. "I feel quite honored to be in the presence of such a wonderful person."

"You are too kind." You complimented her. "Here, allow me to remove these restraints."

With a wave of your hands, the straps unfastened themselves. The girl gently rose from the table and faced you.

"Thank you kindly, good sir."

"Now, you have to promise me." You warned her. "Don't leave this room."

"Why not?"

"Because out there, people won't know you are harmless. They would consider you an evil monster just because there has never been a creature like you. Only here, you will be safe."

Your captive was almost about to cry.

"Thank you so much, sir."

She slithered over to you and gave you a hug.

"I appreciate how much you care about my safety."

She then leaned over and kissed you on the cheek. Your attention was partially to the kiss you received and partially on her breasts being pressed against your arm.

You were happy, your experiment was a huge success. However now, you had a lamia-girl to deal with.