...I really hope that pot being empty is the artist's mistake.
Given that she said she's been waiting a week, along with (what I presume to be) many, many texts she sent out, I'd say that she's been sitting by an empty pot all day for at least a week for her love to come in.
Brimming over with maternal instinct, she becomes flooded with love and romance over her special someone.
Her entire existence is devoted to her beloved, absolutely everything she does is for them and them alone.
Oh, welcome home! You sure are late, aren't you♥. I've been making this curry for a whole week while waiting for you!
Cancer is a Devoted-Type Yandere♋️ Cancer Yandere-sanI'll take care of everything for you, Otouto-kun♡.