S3 never, best start reading.
Why do you want more of this...?
He's assuming Staff won't fuck up some of the best volumes of the series.
Which they will.
Because it was good?
the less lolis the better
JC Staff hates you and money, so never.
Enjoy never seeing the best volumes animated.
It's not really JC Staff's decision to make. I do wish we could get some OVAs of the side material at the very least.
SS2 should really be an OVA at the very least. It would feel weird to have it in the middle of S3.
I would kill for Norse Mythology though.