Random headcanon I have for Erdrrin is when Erdrick is having a nightmare about losing Corrin and then she notices that he’s struggling and tossing and turning in his sleep, then he screams out in fear which makes Corrin wake up and she goes up to him to ask him what’s wrong and he explains his nightmare to her. She gives him a hug and tells him that everything is okay and she’s here for him, Erdrick hugs her back and lets himself be in her arms for a moment. Erdrick pulls away from the embrace, thanking her for checking up on him and cheering him up. Corrin smiles at him and tells him that he isn’t alone and she’s always here for him, resulting her to kiss him on the forehead and he blushes by this. She pulls away from the kiss and tells him that they should both go back to bed, Erdrick reminds her that he doesn’t want to be alone and asks her if he can sleep with her tonight. She nods and lets him sleep with her and ending the night off with nothing but their love for each other <3