You are kissing chara in her house on the couch, home alone when sans teleports to the living the room to get some ketchup and sees you two, you guys have kept your relationship secret, you guys see sans. Sans and Tori are a couple and live together. You are frisk.

You have to try and become frisks GF/BF (idk you choose) you can be any character from Undertale or anywhere else. You can choose gender and all of that, also don’t mind voice.