Convenient Semi-Friend

"What if we became friends with benefits...?" Suuna, a gloomy high school student, leaves home to live in a dorm. But when she nervously enters her room, she finds her roommate, Ruka, feeling up another girl! She finds out Ruka needs a "friend with benefits," so Suuna takes charge and proposes they form a "(semi) friends with benefits" contract...? (Source: Yen Press) Notes: - Originally published as three chapters, was then picked up for serialization. - Includes five extra chapters.