Aoi is a beta who always both admired and envied his older friend Shiki(alpha), who has now become his boss and his sex friend. But when Aoi's body begins to change to that of an omega as a result of repeated contact with an alpha, Shiki is the one to take him home and take care of him, keeping him there until his pheromones stabilize. However, Shiki has been in love with Aoi all along, and he recognizes that their current sex friends relationship has to come to an end before anything real can start. Trigger warning: forced confinement.