Kim tells her, duh.

"Mom, something's off."

"...Kimmie?" Ann set the towels next to the sink, her eyes widening. "Talk to me. What's going on?"

"When you walked in here, I - I mean - I knew that you were sexy on an objective level, right? Y-you could still pass for 29 on a good day." Kim blurted. Ann's cheeks colored slightly, but she nodded. "But - but I've never - I mean maybe once I've had any kind of fantasy about you, and now I l-look at you and I - I f-feel-"

"...go on and say it, Kimmie. I need to know any symptoms."

"I feel so... incredibly horny. I feel l-like I need to pin you to the wall and make you cum, or - or have you do that to me, and - and I-" She let out a sharp laugh, almost hysterical. Ann sighed, stroking her cheek.

"Lowered inhibitions. Didn't see this coming."

"...just inhibitions?"

"Kimmie-cub..." She cooed, kissing her daughter's forehead. "I know you like women. Every time you fought against Shego it came across more as full-contact flirting than anything else."

"Well. Yeah." She would never, ever admit that with anyone else.

"And right now you're with another woman, naked. So in your current state, your brain has decided 'oh hey I want to tap that'. Either it's just that, or you had some attraction to me and you haven't let yourself admit it until now... you did just say that 'maybe once' you fantasized about me." Ann's smile widened slightly. Kim squirmed.

"M-maybe."

"Kim. I'm not going to judge you for anything you say in your present state. Or anything you do." She gave Kim a wink. "Let's get into the shower, okay?" Anything she said or DID? That - was that an invitation?