One of the benefits of an insect's diminutive size is the amount of openings it allows. Primarily, into Alphys' lab. (Asgore's castle is almost free of secret entrances for urban explorers of any species.) A benefit to entering such an entrance is how cool the lab is compared to Hotland. Once the bee found itself in this new, muggy reality, it dove straight into the first building it could see to cool down.
"A long time ago, I made a robot named Mettaton," the bee heard a tiny voice say. The room it had flown into was dark, but it was certain she was in another room. On it flew. Its journey came to an abrupt pause when it bumped into something metal. To recover from the daze, it rested on the metal surface.
"OKAY DARLING," a metallic voice whispered to themselves, so quiet only the bee could hear them, "YOU'VE GOT THIS. SCARE THE KID, LET ALPHYS KEEP THEM SAFE, GET REVENGE LATER." The bee began scurrying up the surface, barely able to see a gloved limb protruding from it. The limb suddenly flinched.
"But, umm," Dr Alphys assured the child, "hopefully we won't run into him!"
Silence ensued, as though she was waiting for something to happen. Three seconds passed, and metallic clanging filled the lab. Alphys muttered something in confusion. "Did you hear something?" Five metallic clangs later, she added "Oh no." Then, a bright light filled the room, before plunging the duo into darkness.
"AAAAAAAHHHHHHHHHH!" Mettaton cried, bursting out of the wall as the spotlight shot him into focus and the Game Show logo descended into view, bathing everyone in disco colours and cheesy music. "A BEE! A BEE! GET AWAY FROM MEEEEEE!" he continued, rolling around the room at random. Alphys and the child pressed themselves against the wall to keep safe. The lights returned to normal to show the computer on wheels swatting everywhere and clutching his "head" while the wheel just took him wherever it pleased. Alphys saw the bee fly out of the hole in the wall seconds later.
Mettaton stopped. "YOU RAT!" he cried, charging towards it. "YOU RUINED MY ENTRANCE!" The bee flew through an air vent back into Hotland, the robot breaking through the door to give pursuit. The lights returned to normal. The music stopped. The logo ascended.
"Would-would you, um," Alphys stammered, "like my phone number?"
The bee managed to elude Mettaton with ease, ducking into the pipes to avoid his wrath. Things were far muggier down here, so it kept going without rest. Whenever it encountered wires, it slashed them without slowing. It was going to find that talking flower soon. And if it saw that child again, it'd end their journey immediately.
"Th... the northern door will stay locked until you..." Alphys muttered into the phone, claws shaking uncontrollably. "I... I think you sh-should g-g-go to the..." She checked the camera feed. To her surprise, the door had opened just as the child entered the area, allowing them through without fuss. "H-huh?"
She watched them waltz straight into the next area. "D-Don't you wanna try the puzzles? I mean," her thumb accidentally hit the red button. The phone hung up. She sighed. "B-but, what happened?"
"GOOD EVENING, BEAUTIES AND GENTLEBEAUTIES." Mettaton called from above the wiring. The pipes had cooled down, so the bee took its time going along. It had flown through a small warehouse full of disguised bombs, including a sleeping dog. He had woken up and started yapping at it, but was completely ignored. He watched the bee fly on with a warped, narrow sense of Determination and went back to sleep.
Now all bombs had been deployed, none scratched by the sting. Instead, the bee was concentrating on a mess of wires, hacking away at two wires per second.
"BRAVE CORRESPONDENT! PLEASE FIND SOMETHING NEWSWORTHY TO REPORT!" Mettaton continued, tightening his dapper tie. "OUR TEN WONDERFUL VIEWERS ARE WAITING FOR YOU!" He and Alphys watched the screen as the child entered the area. "Pick the dog, pick the dog," Alphys whispered as they walked straight past, towards the force field. "They're not very patient, are they?" she added, before staring in shock as the child walked straight through, unimpeded by a force field. "Are you kidding me?" she said with a gasp.
Mettaton sat at his desk for ten seconds in total silence. "AND NOW FOR THE WEATHER WITH MUFFET," he said cheerfully.
She gave up. Alphys slumped in her desk, head folded in her arms. She surrendered. The child clearly didn't need her. Yes, her attempts at being needed by them were quite selfish, but... Who was she kidding? She was being selfish. Slowly, she looked up, in time for the child to enter Muffet's domain.
Some time ago, she got into a spat with Muffet, and she bought a fly swatter as petty revenge. She came to her senses before ever using it, though she kept the chute leading directly into her house intact. Why not? They'd binged on Mew Mew Kissy Cutie 1 before, so this just made things easier.
This was when the bee returned. She noticed the hornet emerge from the shadows at the other end of the room, spot the child and begin charging towards them, with the obvious intention to sting them in the neck or something. She panicked, reflexively grabbing the swatter and hitting a button to deploy her into the chute.
Three seconds later, she fell from the ceiling, squatted in front of the child and swatted the air right in front of her, right paw hitting the floor for balance. The child watched in awe as the bee was sent flying into the cobwebs. "W-woah," they said to themselves.
Alphys got up and dusted herself off. "Are you okay, kid?"
They nodded, frozen in place.
"Holy cowbells, Alphys!" Muffet cried, "That was, that was amazing! Ufufu~"
"H-huh?" She looked at her swatter, the quickly hid it behind her back. "Muffet! Omigod, I'm sorry, didn't mean to-"
"Alphys, you just dropped out of the sky and saved that kid just like a hero! Dearie, I am in wonder. If it weren't for you, I doubt any of us could've saved them."
"You... you think so?" She began to blush. "Tha-thank you."
She placed a hand on Alphys' shoulder. "Now, how's about I bake you some spider donuts, on the house?"
Alphys began giggling to herself and walked with Muffet outside. The bee watched them leave, feeling the legs of several spiders examine it, ready to chomp it up. Then it disappeared in another flash of yellow.
"Y'know, Alphys," Muffet said wistfully, "I love what they did with Mew Mew's character arc in Mew Mew Kissy 2."
"Yeah," Alphys responded, the smile fading from her face.