Sharing Fate (смешанная)

Fate Stay Night Universe-
Uncovering a strange board game leads Shirou, Medusa, and Arturia into a strange series of 'Challenges' that bend reality and time to make them perform various sex acts bringing them closer to each other. Both women love Shirou and are willing to do anything to please him or make themselves more appealing in his eyes. They thought these depraved acts count as that.