You take her to your lab

Inside your lab you had the red haired model chained to a table, naked and bound you took some time to gaze at her form. She was quite a beauty in her natural form, but you had no intent on using her natural form.

First you started to rewire her mind, her values, dreams and morals rewired to suit your needs. Now she would view all men other than yourself with contempt, even her former lover Peter Parker. Women however are a different story, she would adopt a misogynistic stance to other women. It goes without saying that she was now bisexual. As for you, she served you with the upmost loyalty to you.

Next though was to turn her body into what your own toy and weapon. First you introduced hormones to cause her hair to grow down to her knees, while maintaining its natural silkiness. Then your proceeded to do the fun parts, you inflated her breasts to gravity defying F-cups, while tightening her waist be no larger than that of a Disney princess.

Next you altered her ass and legs making them more shapely and firm. Her ass being expanded to make her the very definition of a bubble butt. Then you altered her feet, ensuring that she'd always find high heels far more comfortable than any flats. Finally her face was remodelled to something beyond that which any Photoshop could achieve, she was by far more beautiful than fantasy.

As for your final step, you implemented her with her own powers. Not flight, strength or anything like that but rather only two powers. The first was a poison that would if ingested into any male (besides yourself) would kill them, but if ingested by a female it would cause them to enter a trance like state where new commands could be implemented. This poison was transferred by kissing as such she would need to seduce her target first.

That was where the second power came in, pheromones that would make anyone who spent a certain amount of time with Mary Jane develop at least bisexuality. She would need to seduce them on her own merits however.

Although with all the advantages you had given her, you doubted that would be hard.