It's nice that the artist didn't use the weak constitution thing as a one-off gag and then promptly forgot/stopped caring about it, it's details like this that makes me like this comic even more.
...Thanks for taking care of me.Haha...I feel like I did something bad...Oh yeah, I had that sort of setting!You have a weak constitution, after all...We were worried!Eh? Eh!?Secured!That's no good! You have to rest!Yes!?Ahhh, Mahiro-chan!