Tanjiro
-A little surprised
-Smiles widely and blushes a little
-Didn't think someone as amazing
as you would like HIM
-Happy being around you
-Openly asks about your crush
(In a way, he's teasing you)

Nezuko
-Gets even more shy with you
-Tries to crack up jokes
to make you less nervous
-But it makes you more embarrassed
-Gives you literal heart eyes
because she found it so cute
that you have a crush on her

Zenitsu
-Gained even more self confidence than he already had
-Would be so happy and
proud about it
-Smiley face 24/7
-Would tease you with skinships

Inosuke
-Didn't know what it was at first
-but when he did
-He was actually flattered
-Either shy as hell or confident as hell
-You're the one who has a crush on
him, but it'd look like he's the one
crushing on you

Giyuu
-A little awkward but in a very
cute way
-No one has ever had a crush
on him so he doesn't know
how to act
around you
-Goes soft with you
-He even gave you warm smiles
a few times