Yu and Roku end up together. Makoto and Ai who r step brothers also end up together. Makoto fucked Ai in the past but doesnt need him n fuckd Roku maybe cz he looked like his mum. Anyway things hpnd n Makoto as well as Ai both feel lonely but Ai never told untill the end. Yu who was kidnapped by them n got slightly involved cz of Roku got in trouble few times tho it wasnt extreme. Anyway wen Roku betrayed Makoto, Yu n Roku got close. Makoto came searching for him after n dat was wen Makoto told Ai to fuck Yu dis time (the 1st time he told ai to masuturbise him) but Roku was like i never loved u the slighest cz Yu was telling to say how he feels n Makoto was like tell me dat u love me.Makoto was bout to hit Roku but took or maybe gave the punch/receive to/from Makoto. Den Ai and Makoto left while Roku and Yu were together.Yu said i would do that for the person i love n Roku started jerking him ig. Dats when they fucked n Roku also said ur cute i love u n all dat.So dis time roku is not bottom but top (seme) n Yu is uke. Meanwhile wiv Ai and Makoto- dats wen Ai confessed how lonely he was n wanted Makoto to keep looking at him cz in the past Makoto used to look at him.(i thought Ai will be seme but turns out his uke while Makoto seme) So yh they fucked.
Btw Roku went to jail for idk how many yrs n at the end he is no longer in darkness but can live freely cz the enemies r not there anymore
Yonin no Nibiiro