What does 44th on page 11 mean?
I didn't understand it either, but after reading the Spanish translation, it clicked for me. When Touka went to Shirasawa's house disguised as Kaho, they played the 43rd Nipple Guessing Game:
So in this chapter, she's wondering if they're going to play the 44th Nipple Guessing Game since it's just the two of them there.
It's a little hard to see but it's on the panel. I imagine it was the same in the raw version, but I think the font choice was unfortunate. The 'G' in the left corner looks like a 'C' because Touka's hair covers part of it.
Also, I don't understand why she's thinking that, especially considering she has no idea that Shirasawa knows it was her in disguise and not Kaho. Maybe it's because she's nervous and, as we know, not the sharpest.