You rubbed your eye due to some makeup Tengen Uzui forced the quartet to wear for this mission

“Are you alright?” Tanjiro asks in a quiet voice despite the fact you two were alone

Since you two were alone in your shared room, which is why he could only now voice his concerns freely. You were lucky to be roomed together for both being new to the house, ‘sold’ together, and are ‘both girls’

Of course this is all just an act for the mission but it works out in your favors other than having to share EVERYTHING together

Now it was up to you and Tanjiro to figure out what happened to Uzui’s wives