Koushi isn't a forgetful person, in fact he's very organised, but like everyone, he has off days. And when he forgot his bento box, you were kind enough to share yours. He was embarrassed about it, knew he should have checked his bag before leaving the house. But your cooking- oh, your cooking- that definitely soothed his pink cheeks.

And then it... became a habit- 'habit'. He tells himself that as his way to feel better about purposefully 'forgetting' his lunch just to taste yours.

So you're not surprised to see him heading towards where you're sat, rubbing the back of his neck with a guilty grin. "I kinda forgot again..." he lies through his teeth.