[Oh... it does break her heart that Sanae doesn't want to take a bath with her. Still, she wasn't the type to give up easily.]

I haven't seen you as much, Sanae... you know, I'd throw out every bit of that soap if you asked me to. [She was way more valuable than alone time with some soap. Anyways, she starts unbuttoning her blouse, revealing a black and lacy bra underneath. She carefully peers at her sister, wondering what could be wrong. There was definitely something she was hiding. It was her job to figure it out.]

Do you, [she reaches back and- pop- undoes the hook on her bra. It immediately falls off her body. Those breasts, that were barely contained to start with, heave a bit in their freedom] not want to spend time with your sister anymore, Sanae?

[she folds her arms under her chest, which pops them back up a little again]

If I've done something to make you hate me, let me fix it...