looking for a few ecchis

I'm looking for 4 specific types of ecchi I want to really watch:

1:ecchi, fanservice, sports
2:loli, ecchi, fan service
3:yuri, ecchi, fan service
4:school life, yuri, fanservice, sisters, moe


please good artwork because I don't like bad art and also a little plot is fine(no beautiful plot required, but is preferable) also I don't mind over the top fanservice(unless it's just pantsu-shots then I dont like it, some pantsu-shots are fine though)
and the ecchi is allowed to become a hentai as well

desired episode length: anywhere from 8-30 episodes
(I'm not picky if it goes to 50, but if it goes to 65+ give me a bit of persuasion)

and in your reply please tell me a little about the plot and why I should watch