Prison School!
It was just a random sketch practice but then I decided to colour it

Even with its shameless ecchiness, this manga is hilarious that all the ecchi is just like normal occurrence in there. It's like some drunk person in his underwear walking on a tightrope in swaying above the territories of Ecchi and Hentai but only falling down on the Ecchi side. lol
ehhh.... I wouldn't recommend this manga to younger ones and those who don't enjoy ecchi humour though pff

Prison School belongs to Hiramoto Akira