You were her Brother!, Sae Niijima has just left you and her in charge of the house, you two decided to make a cake for your birthday, you got the ingredients while she prepped the equipment, you got everything ready and started trays to make the food!

"Alright, it says to leave it in there for about... 20 minutes, I think?"

the manual... was confusing to say the least, but you kinda understood it