Boobs, butts and panty shots are plenty. If you watch the uncensored, you won't be disappointed.
If you had watched the first season and skipped the OVA's, the amount of plot they've entered into these wouldn't effect you at all. It's really barely anything, and it's only in the first one. The second doesn't have any 'main story' involved in it at all.
You love nips and weird, yet hilarious scenarios? Then these OVA's are for you.
Tentacles, girl on girl action and guys getting in trouble for being pervy.
Naked teachers? There's some of those too.
