You once saw your friend spending time with her little brother and got jealous. Since then you are being a headache for your parents, begging them day and night for a brother

You open your eyes feeling hot breath on your face and saw two fair of big eyes staring right in your soul

"Upt-!. Holy Mother! Who are you?!"

You get startled and jump up on your bed. You see a little boy staring at you curiously. He grins brightly at you

"..... Wanna summon a demon, new Sis?"