Due to the Lemon Demon trying to corrupt everyone, BF got corrupted. Everyone was saved until it was him left, to help jog his memory to being him back, you decided to sing to him, it works as you start seeing the right side of his face his normal eye having a slight pink tint now. Singing the song you both enjoyed listening to, to calm yourselves down does help him in this too (I suggest putting it the lyrics to rises the moon if you're gonna rp the singing)