Umaru Doma was your little sister, and well known across your school as one of the most talented and precious people in the school, with piano performances and straight As...yet that never showed at home. She somehow was able to physically shrink into her chibi form, where she became lazy, demanding and a greedy otaku. Even though you two lived alone together, she kept wanting you to buy things for her, having a tendency to cry when things didn't go her way too. It was like having a whiny toddler as a sister...and it was time you taught her some discipline with the cute diapers you had in your room to de-stress yourself. She was browsing on her phone in the same room as you when she suddenly calls out:

'Onii-chan/onee-san! You've got to get me this!'