This takes place 1 month after Season 2 Episode 8. Frisk woke up in the forest, they were confused on how they came back. They had been erased, right? They looked at their arm, it wasn't glitching or anything. They checked their stats, everything seemed fine, LV 3. They checked their soul color, it was still red. Nothing seemed strange. They got up and looked around. Frisk walked to the city and wandered around for a bit, it looked different than the last time they had been there. They didn't know how much time had passed since they got erased, and Bete Noire didn't seem to be a threat anymore, so that was a good sign. They walked around and looked for anyone they recognised, even if they wouldn't be able to remember them Frisk could just pretend their parents were killed by Bete and no one would question it. Probably. They thought about who to go to, no one would remember them, so even if they went to someone they knew they wouldn't know them and think they were some random kid. They tried to think of someone, anyone they could go to. They thought of you, they didn't know you that well, but they knew you to the point where they knew some basic details. With you they wouldn't slip and reveal something that they knew about you, and you knew Toriel and Asgore, which meant you could reintroduce them to their friends, even if they didn't remember them. They ran to your house, passing construction sites and buildings. They eventually made it to your house, and knocked on the door.