Transfigure her into a MILF

That night, you had a delicious dinner with your mother and sister. They quickly fell asleep due to the potion you mixed with the food. You brought Ariana to her bed, then came back to your mother.

First, you pointed the wand to her and said: "Obliviate!". You adjusted her memory and personality. From now on she would think anything you said was right and logical.

Then you performed some transfigure spells to make her a hot MILF. You gave her a tiny waist, a pair of big breasts with hard nipples and removed the creases on her face.

Finally, you let her drink a potion that restored her vitality. It also made her internal organs work better, especially the reproductive organ: she was currently at the top fertility of her life.

After everything was done, you woke her up.