"Alphys!" Frisk burst into the laboratory; the scientist had been expecting her friend, but not for them to arrive in this manner, with a full bag and a lot of enthusiasm.
The lab was as much Alphys' home as it was a lab, as her older one had been; the entryway, warm and homey, had two main doors. One led into the lab area- which Frisk avoided, having had enough of laboratories- and the other into an apartment, which had become almost as much Undyne's as Alphys'. There was a decent sized living room, a kitchen (with plenty of fire safety measures) and a fairly large bedroom and bathroom. Alphys was in the living room, and Frisk joined her, carefully placing their bag next to the sofa.

"Guess what I got!" The human was grinning; an infectious grin that Alphys suddenly mirrored, despite not knowing what was going on.
"Um... Did you... Finally get a puppy?"
Frisk laughed. "Nooo- I think, uh, that'd be weird, living here. With, you know, the dog monsters? And I think Papyrus would never come over again." They pouted. "Boo. Maybe one day. But no!" They grinned again, bouncing. "This- well, I'll show you!"

They opened the bag and poured out the contents. A few video game controllers and a load of video game cases slid out.
"Now we can play together, instead of taking it in turns! And Toriel got me a console so I can play some games at home, and I got loads of new ones... Some of them, um, I don't know if they're any good. But a lot of them we can play together, and-" they were collecting some together, "-some are ones for me. There's some really interesting looking ones that I read about as well, but they're all rated for... um, people older than me. So Toriel won't let me get them." They pulled a face; but this inconvenience didn't hold them back from their excitement; which rubbed off onto Alphys.

"Okay! What are we playing first?"
"Well, I got... This!" They grabbed a case out of the pile. Most of the games they played together were old ones; Alphys had modified her computer to be able to read and handle games that weren't supposed to be on the PC and route them through her TV. It resulted in her having a huge computer case just for gaming, but to her, that was no big deal. And Frisk was fascinated by the games- although she tried to hide the more... adult ones that she collected from them.
This game was a newer game from a series they'd played before. "It has a story mode," Frisk said, "where you have to fight together- and you have to use lots of different characters, and I thought it would be perfect to do with you!"

When Frisk was happy- truly happy- it was infectious. She grinned at the child's expression, and busied herself with sorting out the controllers and loading the game while Frisk got drinks and snacks. They'd spent enough time over here to be completely at ease helping themself to the kitchen, and they came back with two cups of fruit juice and a bag of popcorn. Frisk always tried to steer her away from her least healthy choices.

Alphys joined them on the sofa; and they played the first round, laughing at themselves and each other as they tried to learn to play the game the hard way- and failed, losing all their lives. Frisk was still giggling when Alphys turned to them during the reload
"H-hey, Frisk? Can I ask you something? Do you, um... like anyone?"
"Huh?" Frisk stared at her. "Mettaton asked me that a few days ago! Kind of. In the way he has." They pulled a face.
"W-well, I was, just, wondering." Alphys looked extremely awkward. "I mean, it seems like you spend a lot of time with, with Sans..."
"Wha- you think I like Sans? Like you and Undyne like each other? No! Ack, no, why?! I don't like anyone like you like Undyne! One day I'm- I'm gonna friend-marry all of you and then nobody can ask me that again." They pouted.

Despite her clear discomfort, Alphys let out a high-pitched giggle. "'Friend-marry'?"
"I'll make it a thing." Frisk crossed their arms and slumped down in the sofa. "Then everyone can know that I can spend the rest of my life with my friends without, you know... smooching."
"O-okay! Okay. I got it. You don't want to- to smooch Sans. I get it. We can go back to playing, it's fine." Alphys quickly pressed start.
"I don't want to smooch anyone, Alphys," Frisk said as the game started. "Is that... normal? Is it okay?"

She paused the game and turned to Frisk. "Um, it's f-fine? I guess? I mean... I've... always liked people, but... if you never do, that's fine too! As long as you're happy and we're friends."
"Well." Frisk thought. "I might like someone. One day. I don't know. But even if I do- if I can have my friends in my life forever, then I think liking someone- like that- it doesn't seem to matter if like them if I can be friends with them anyway."
There was an awkward pause before Frisk spoke again. "Wh-why do people think I, um... I like Sans?"
"O-oh! Well, you... spend a lot of time with him? And in a group you always like to be near him? So I guess people thought that maybe- I guess it was stupid to think it..."
"He makes me feel safe," Frisk said. "And, uh, I guess..." They paused, wondering how much to say. "I feel like he's not been happy much. And I want to help him be happy. Does that make sense?"
"It- yeah. Yeah, it does."

The topic was dropped, and they kept playing; gradually getting better, Alphys consulting the internet occasionally on how to play. It involved a fair amount of helping each other out, and between their laughter and yells of "watch out!" and "over there!" they didn't notice Undyne come in and watch from behind the sofa.
She waited for them to finish the stage they were on before leaning over the back of the sofa. Frisk let out a noise of surprise, but Alphys grinned.
"Hey nerds!" She reached over to give Alphys a one-arm hug; but was surprised by Frisk turning around and putting their arms up. "What, you want one too, punk? Eurrrgh, fine! But you're still doing those laps at school tomorrow!" She gave them a quick hug too, before jumping over the sofa and landing between them.
"So, what, you can play together now? Am I ever going to get the TV back?"
"You can play if you like." Frisk offered her their controller, but she laughed and shook her head. "No way, you two stay here and nerd it up. You stayin' for dinner?"
"If- if that's okay."

Frisk texted Toriel while Undyne got up and went over the the kitchen, starting to cook. She was learning to do so with less fury and overblown passion- although the occasional yell or grunt came from the kitchen. It was anyone's guess as to how edible the food would be when it was finished.
"Hey, guess what," Frisk said, once they'd put their phone down. "I think m- Toriel wanted me out of the way, with these. And Asgore had come over! It was the first time I've seen them talk without, you know- her looking all angry."
Alphys gasped. "Do you think-?"
"N-not yet! But, um, I hope she's going to forgive him. Maybe. I hope."

They continued playing games until Undyne finished making dinner- which was good, if a bit too spicy for Frisk's liking. Undyne had discovered chilli peppers, ginger and dried spices and was as enthusiastic with them as with everything she did. When they headed home, they were beaming. They'd only been able to play one game together, but Frisk had a console at home as well now- even if it was an old one. They really liked video games, and playing the games together was way better than taking it in turns, they decided. Maybe also better than playing alone- although they'd have to test that to be sure!

It's about time we had some angst-free fluff! I see video games as being a big thing that Alphy and Frisk share, so here we go. Just some gaming time together.

Given how close Frisk and Sans are, and Frisk's age, it's likely their friends would start having some raised eyebrows, thinking they have a child's crush. I think they're just too busy being happy about having friends who are like family to think further than that for now.

-Ren