Phoenyxx, the first raw avaliable is always censored. Then a new uncensored version appears. I don't know if it's a kind of mature filter or the episode is aired twice (with and without censorship).
Just now a less censored version is in YouTube. So you can see the BE scene just at the beginning of the third part.
About what you mention of the nurse, that could be possible... assuming that in the last scene she returned her youth, but if that was, why she still was in her adult form when the other girls arrived?. It was after she put her hat on that she reverted to normal. Also, as Yukari and the nurse were talking in the end, Yukari looked at her hat that she had left there since her transformation, so maybe there is something more.
The only way to know for sure is to way for the sub version.
In the meantime, here are the links for a less censored raw version.
http://es.youtube.com/watch?v=BvfgEpevy0s
http://es.youtube.com/watch?v=-TL33ZkjIPk
http://es.youtube.com/watch?v=8slOYoXREME