Yakin Byoutou

If you like Bible Black, then you can move on to NSN. 

Set in hospital, these hentai titles focuses on nurses and how they are being used in sexual ways. 

both anime has nurses and the setting is in the hospital 

In both hentai the main character uses blackmail to force women into having sex with them, And also both hentai contains rape, Which is a good enough reason for you to watch one if you've seen the other.  

Both involve doctors taking advantage of the nurses while doing extreme experiments on them. 

It's about nurses