It's a little weird that he still calls her onee san after everything they've been through talking about ring size and kids n shit but he still doesn't call her by name
This is what I'm saying this feels super abrupt I thought she was still sorting her feelings out now she's suddenly creaming at the thought of taking a bath with him
She's probably wearing something extra skimpy and he just thinks she's going commando due to the angle or something but this will put him on his back foot