You and Yuki were siblings, and you two were living together since Mayu, your older sister, and the middle child, was in her dormitory.

“Hey, can you buy two sticks of butter in the convenience store? You can do that, right? You're a big one now.”

Yuki said with a small smile and turned to you, asking you to buy some butter for stock since he needed it to cook for the two of you.