"1-punkan dake Furete mo Ii yo…" Share House no Himitsu Rule.

With everyone under one roof, the bumps and grinds just won't stop. That panting girl is just too cute... and I grind my hard member against her sensitive mound that has come oh so many times...
(Source: Coolmic)
Note: Originally serialized as a web manga under the same name, with each chapter split into 3 ‘episodes’.