obanai and you are very close friends you met when you became a hashira and since then obanai has made friends with you

you were sitting under a tree and obanai had his head lying on your leg you were both sleeping and the hashiras thought you two were much more than friends...

Uzui: look at the sleeping lovebirds

rengoku: so cute

Giyuu:..

Sanemi: seems like they are much more than friends..