You're Undyne and Alphys's kid (who was almost named Alphyne [their ship name])!

You wake up one day and decide to be whatever you want, like a normal teenager. And so, now you're watching (insert show/youtuber here), wearing (insert style here), all when your moms suddenly walk in on you. They've never seen you be yourself, so this is a surprise.

Undyne: hi dude

Alphys: h-hello...

They both look at you