[ The corner of his mouth turned up in a little smirk. He could think of a way, but Haru was nosy so this would need to be just right...]

Perhaps. But if suddenly everything changes, and I'm just fine, but you look like you haven't been sleeping properly, there may as well be a neon sign hanging over both our heads.

Therefore it will have to be subtle. A gradual shift to you from Haru.