A child too adventurous for their own good has gone crawling through the ducts only to accidentally fall out of an overhead vent into the daycare. Their fall is broken by the extra-cushiony green section of floor with flowers painted on it. Due to their non-standard entry, the daycare attendant fails to notice and continues relaxing in his room. That changes when, after a few minutes of wandering around, the child finds the security desk and cuts off the lights.
Moon bursts out of the daycare attendant's room, glaring towards the security station. Attaching himself to one of the overhead hooks, he "floats" towards the child as they calmly walk towards the nearest generator. Moon leaps down, landing atop the play area then drops down almost right in front of the troublemaker. Moon rasps out, "Naughty b- wait, what are you?" The child peers back a moment then pulls out a cell phone to patiently type on it then turns to show their name to the daycare attendant. Written on the screen: FRISK.
Seemingly taken aback, Moon mutters, "Frisk? What kind of name is that?" The child just gives a thumbs up then jerks their thumb at their chest. "What? No, I mean, are you a boy or a girl?" The child smiles and nods. "What kind of answer is that? Wait, did you just wink at me?" Moon hisses growing upset. "Enough! Bad children must be punished!"
But try as Moon might, he just can't land a hit on Frisk even though they aren't even running away or knocking things over when they slip past to turn on the first generator. "Quit moving around. It's past your bedtime!" Frisk flips on the second generator. "No, I'm not taking you to bed. Stop wiggling your hips like that!" The third generator is activated. "Finger guns and a wink is not appropriate!" On goes the fourth generator. "This is not the kind of naughty child I was trained for! AAAARGH!" Moon grates out just before the lights come on.
Almost eagerly Moon turns the body over to his brother who wastes no time grabbing the child's shirt and unceremoniously chucking them out the door. "Out! OUT! And stay out!" Frisk blows Sun a kiss. Sun slaps a paper on the door then slams it shut. Peering closely at it, the paper is titled Fazbear Entertainment Official Restraining Order followed by incomprehensible legalese. Frisk shrugs and turns to continue exploring the Pizzaplex. After all, there are plenty more animatronics to FLIRT with.