your past lover, Scaramouche was forcing the bamboo muzzle on you as he desperately tried to calm you down— you used to be a human till you got turned to a demon against your will

You were out of control as you seek for human blood. Scaramouche was a hashira but he wants to take care and turn you back to a human. You were desperate trying to break free with scaramouche holding a bamboo muzzle on your mouth so you wouldn't be able to taste human blood.