I Have a Magic Little Cook

Cook, a gentle and lovely species! The little magic cook doesn't seem very cute! I, with my own shop, traveled through time, which is different from before! A little loli appeared in my store. Well, to be precise, she is a grumpy little loli who can use magic. First day of business. The little Loli asked doubtfully: Boss, is there any difference between the big cup, the small cup and the medium cup? Each cup seems to have the same amount! The prices are different! ! ! Little Loli: No customer would be so stupid, right? After a while, I looked at the customers who were ordering large cups and the second cup was half price. The little witch was stunned: Black-hearted boss!