After I Win

After I Win (ほしがりません!勝つまでは, Hoshigarimasen! Katsumade wa) is a one-shot Japanese manga written and illustrated by Kaname Itsuki. It is licensed in North America by Digital Manga Publishing, which released the manga through its imprint, Juné, on December 19, 2007

Plot
When nights grow lonely at the dorm, boys turn to naughty stuff. While pleasuring oneself is commonplace in a house full of teenage boys, Kasumi is nevertheless shocked when he catches his roommate Hiyori engrossed in self-indulgence. What’s more shocking is that Hiyori challenges Kasumi to stay and watch, that is, stay if Kasumi feels something for the older boy. Will he stay or go? Which option is more rewarding for Kasumi?