About time I do a little Undyne/Alphys eh? X3

Enjoy!

Alphys is running back and forth in her house at a speed Frisk never thought possible as he and Asriel watch Kill La Kill on Crunchyroll. After an episode or two, Alphys stops running and looks at the two.

"How do I look?" She asks nervously, her forehead beading with sweat and her body shaking. Frisk smiles and grabs a tissue, then wipes away the sweat.

"You look beautiful as always, Alphys!" He assures her. Asriel snorts behind him.

"How many of your friends are you gonna flirt with?" He asks. Frisk glares.

"Everybody but you, which I guarantee will never happen." He retorts. (We all know what's gonna happen though X3) Alphys chuckles breathily in response.

"Th-Thank you, Frisk.." She stammers. Then she lets out a noise very much like a squeak as there's a firm, loud knock on the door.

"Hey Alphys!" Undyne booms out from the other side. "Are you ready yet? Asgore told me about this great restaurant and..." She opens the door and stares at Alphys. The reptile is wearing a deep blue dress with soft purple swirls patterned in, contrasting sharply with her orange skin. The pottom is frilled out with a soft, almost furry looking violet fabric. Undyne's blue scales seem to darken to a soft purple before returning to their normal shade as she grins. "Wow, Alphys! You look real cute in that!" Alphys blushes deeply and grins nervously, noting that Undyne's only wearing jeans, combat boots, and a new leather jacket.

"U-Uh...thanks Un-Undyne...! Sh-Should we g-g-go?" She asks. Undyne nods and brushes her scarlet bangs out of her eyes, then reaches down and grabs Alphys by the hand.

"Come on, let's go!" She all but drags the scientist/otaku outside while Asriel and Frisk watch.

...

"So...Asgore recommended this place...?" Alphys asks, looking around nervously. It's a fast food restaurant in the image of...three guesses...Mettaton. The robot has skyrocketed in popularity since his debut (much to Burgerpants' displeasure and loss of a bit more of his almost stagnant sanity). Undyne grins widely and laughs.

"You bet he did! The big guy's got a real thing for steak!" She pulls Alphys in and orders a table for two with two Mettaton Steaks and three Starfaits, then leads her girlfriend to the biggest table there. When a snooty looking waiter starts to object, Undyne offers a terrifying sneer as a turquoise spear materializes in her hand. It disappears as the waiter almost sprints away.

"S-So, uh...I f-found a new anime we can watch..." Alphys says, smiling. Undyne's eyes widen in excitement.

"Really?! What is it?!" She asks. Alphys suppresses a laugh at the former Royal Guard's eagerness.

"I-It's called, uh...S-Sword Art Online..." (Come at me, haters XD) Undyne's ecstatic grin widens.

"You had me at sword, Alphys! I can't wait to watch it!" Then her grin turns slightly embarrassed as she rubs the back of her head. "But, uh...we'll have to do it at your house..."

"Why?" Alphys asks, frowning. "Did something happen?"

"I, uh...got carried away teaching Papyrus how to cook lasagna...eheheh..." Undyne laughs nervously. Alphys blinks, then grins.

"You just can't help yourself from going crazy with cooking, can you?" She asks, blushing as she begins to laugh. Undyne shakes her head, unashamed of the fact.

"Nope!" Then she grins. "I've got Asriel and Frisk in my gym class this next week. I've got a few new exercises that I'd like to see them try out." She chuckles. "If Asriel's anything like his old man, he'll pull through without complaint. Frisk, on the other hand..."

"Hey, never doubt that kid when it comes to Determination." Alphys replies. "He's gotten through a lot of his life just from sheer will to accomplish it."

"I know, that kid's incredible." Undyne starts to laugh. "If only he and Asriel knew about the fanfictions that you made about them!" Alphys blushes deeply, her eyes widening.

"You're not gonna tell them about it, are you?" She asks. Undyne shakes her head.

"Nah, of course not! I'm too busy shipping it in real life to care!" She laughs. "But you capture their attitudes pretty well!" She looks around, then lowers her voice. "Not to mention those ones about Toriel and Sans~..." Alphys grins.

"Why're you whispering?" The reptile asks. Undyne looks around again.

"Just in case Asgore's around. I swear, he's got ears like a...like a..."

"Like a goat?" Alphys suggests. Undyne laughs and nods. Then she looks serious.

"He's still not gotten over Toriel. I keep telling him to put himself out there, but...you know." She shrugs. Alphys slowly nods.

"Yeah...I don't think Toriel really likes him much anymore..."

"What about Mettaton?" Undyne asks. "Has he found his special star?" Alphys gives a short laugh.

"His special stars are Shyren and Napstablook. I don't think he's really interested in relationships of a caliber beyond platonic." Undyne hums and nods, drumming her fingers on the table as the food finally arrives. She thanks the waiter and digs into the steak while Alphys sips her Starfait. "Although...I think Papyrus might be crushing on him." Undyne chokes on her steak and spits it out. It flies across the room and splatters against the window. She laughs while people start staring.

"You're kidding, right?" She asks, still grinning. Alphys shrugs. "Damn...what makes you think that?"

"Papyrus likes that he's really popular, he's a diehard fan, he's been to every concert, it's the only show that he watches..." She shrugs again. "The list goes on." Undyne nods, then bites her lip. Silence goes on for several moments, then she looks Alphys dead in the eyes.

"You know what?" She mutters. "Screw it." She leans forward and presses her lips against Alphys'. Immediately, the scientist's entire body goes red. Undyne finally pulls away. "I love you." She says simply. Alphys looks like a statue. Then, finally, she tips over and falls off of the chair. Undyne roars with laughter.

I thought this was a great way to end it XD