Episode 12 is up:
http://himado.in/66547
Seems they condensed most of volume 5 in there, but messed around with the order of things too like having that mother of the baby survive- I think she died in the manga.
But basically, Chifusa gives back Ouka's boobs by karate chopping Ouka. So there is some expansion there on Ouka, but Chifusa shrinks yet again. She tries replicating the boob flow karate chop on Kagefusa but it doesn't work.
Anyway, kind of disappointing- the series definitely peaked around episode 8 in terms of Chifusa's size and there really wasn't much BE, especially compared to the manga. Oh well, maybe the OVA with the BD will have some.