Bokura to Usagi no Koi wa Sensou
Other names: 僕らとうさぎの恋は戦争, Love & School Tribe
Author: Nagarenai Tissue
Artis: Nagarenai Tissue
From Hoshikuzuu Scans: The ordinary Santarou has an extraordinary secret. And it's that he gives off pheromones to the boys around him. His childhood friend Sukai, transfer student King, classmate Mimi and even Tomomatsu. He's used by them over and over again! B-B-But, this won't do! He's not some sex slave! But it feels so gooood...