Doushite Boku ga!? Ijimekko to Harem Ecchi!

A sexy moan comes out of the same mouth that usually hurls insults at me. Her sensitive body reacts to my fingers moving inside her. I'm living an X-rated harem life with my bullies!?
(Source: Coolmic)
Note: Originally serialized as a web manga under the same name with each chapter split into 3 ‘episodes’, resulting in a total of 18 episodes.