CosmicSenpai's manga / #master x servant(4)

Aristocrats with long lives hire servants and can only be killed by the vs solution. Ukekun starts working and falls for the master, but he's already partially corrupted from his childhood and is mean to servants. (Trigger warning non-con) (Also not really horny)

Second couple beta x alpha

*see "Hydrangea cage"* Sequel? Side story? Its the same universe.