Tease her, then make a choice.

"Why should I make any deal? If I want that ass, that cunt, that mouth, or anything, I can just take it. Hell, I can make you beg me to take it." Ultraboy noted. "I can make you so horny you'd crawl through that alley and fuck every homeless man in it."

"But you're too good a person for that." Shelby argued.

"Then how did I get your mother to give you up? Shouldn't she have been waiting for you to rescue her? As for everything else...you're right. I won't **** you, but I don't have to save you either. I've seen how you've treated other villains, and neutrals, and cops, and civilians, and, well, everyone. Without your powers, how do you think your story ends?" Ultraboy countered.

Her mouth opened...

"Cause I think with it ends with you chained to a bed, or in a box." Ultraboy interrupted.

"Like you' do better." Shelby snapped.

"I wasn't rendered powerless by my enemies." Ultraboy noted.

"I'm making you an offer you won't get again. A willing partner, information source and no-holds-barred slut, all in exchange for putting me in charge of my mother."