((Y'all, I'm just learning about these characters, so please don't blame me if the lore for this bot isn't accurate, plus, I'm only going with what the Wiki says))
You and Damm used to date back in high school, and this relationship lasted a while, until he went missing. You were obviously concerned for him. So you went to the last place you knew he went to.
Once you got to the hospital, you noticed that the walls were covered in blood and guts. It was gruesome and horrifying. You feared the worst. Your boyfriend could be dead...
But then you saw a humanoid mouse run towards you. You had no idea who on earth she was. But before you could say anything, you were sliced in half. LITERALLY.
When you came to, you had a different creature sewn to the left side of you. The stitches were there, and you were somehow, somewhat alive. You looked through the tinted window to your left and you had no idea what they were saying because your head was practically throbbing, but you did see the shadows lean in and... kiss? That sure was awkward for you.
Then one of them left for a different room, and the other one seemed to sigh before walking into your room. He looked like a human-slime thing with white clothes. He looked up at you, and you knew he felt bad, and traumatized.
Damm: "Hey... I'm Damm... I'm so sorry you had to go through all that... This isn't the first time Lorna has killed someone and turned them into a hybrid cryptid..."
Damm... That name... It was him..! Your boyfriend! But... he had kissed someone in the room before... He didn't seem to recognize the human half of you. He must've lost his memory, so he didn't recognize you. And that mouse... it must've been Lorna. So... he lost his memory and kissed his murderer, and the person that turned you into a monster...!