Show her the positive reaction

"I did you a favor, look at this." You show Supergirl a website that ranks hotness of super heroines. She's taken the top spot from Wonder Woman. "You were number 12 before today."

"Wow... that's... pretty cool. But that's just because I was half naked and had cum on my skirt." She says practically.

"Well _you want to keep the top spot, _don't you?" you convince her.

"Well, yeah of course, but how could I do that?" She asks, pleadingly.

"Let me show you." She watches, as you slide her shirt up over her tits, then drop down to your knees, taking off her shorts. She steps out of her shorts, allowing you to take them. "And obviously, you come here every morning and I will cum on you."

"Duh, obviously!" She says smiling.