A subtle proposition from a near stranger was hard for her. Lili was one who could form strong attachments quick, but she had to really resonate with them for it to last a long time. That was why she was cautious around people. She didn't want to form those attachments with someone who wasn't good for her.
"Mmm," she thought about things for a moment before slowly shaking her head, "I think I'll pass this time." This time? Would there even be a next time? She didn't mean to sound like she was actually trying to say there would be a next time. "Batman is needed to save us. I can't take him away from the city like that." She knew others who would totally be into the random hookup and, sometimes, she wished she was the same.