I love the headcanon/scenario in the academy au that when Sanemi finds out all Giyuu eats at lunch is fucking bread he forces him to eat a real meal (aka a meal sanemi made). No wonder he has all that energy to chase students when all he eats are carbs. It starts with Sanemi simply shoving his own lunch at Giyuu and it progresses to Sanemi making 3 lunches (one for him, one for Genya and now one for Giyuu.) the downside is now when Sanemi calls off work Giyuu doesn’t eat lunch at all because he wants Sanemi’s cooking.