You're correct the first non delusion is 33.6 as referenced at the end of 33.5.
I think Luigiymario2 meant to say is that it's the first canon sex and everything else before is just Big Bro's lewd thought (All Nakadashi BTW lol. But at least he's responsible enough to put on protection irl but...
The A and B part?
I did but my raws are strictly pages/chapter that hasn't been scanlated yet.
For example several ch. 37.5 pages have been scanlated, I put the rest of the A part as 37.6 and the B part as 37.7