From what I've read there was no blackmail, she just strips, asks Aya to strip (which she just does) confesses to her and then they sleep together, just slept though.
Hi, translator here. What @hmatyko is doing is seriously NOT okay. He's linking the pastebin account that I use to share the translations (Not final, mind you) to the typesetter on 4chan. Not only is the translation not final yet, but it's also a massive spoiler that's not even from the next fucking chapter. I'm pretty sure this is against some kind of rule, too.
Haruki's pretty cool so far, except for the way she thinks Aya belongs to her.
Kuro's taking advantage of Aya but she's letting it happen so this shit is just gonna get more complicated