well he's part of his harem. so he can't be going around fucking other people. especially if he's doing it to catch his attention lol is my understanding of it.
I think that it’s considered disrespectful for anyone in the harem to sleep with anyone other than the padishah so Shuruka watched once for Tei to know how to do it safely and that was an exception that the pink haired guy assumed he now had Shuruka’s favor and could do whatever he wants. Shuruka only sought him out the first time cause he’s the only male concubine and wanted to know how men have sex. I suspect the pink haired guy has some relation to Shuruka’s mother and that’s why he didn’t kill him.
I think he was just mad because he had a flashback of his mom lashing out at him when Tei pushed him away and took it out on the guy?
Why did shuraka kill that other guy, why is he stopping that pink haired guy from fucking other men ?¿?
I guess he went to see the first time to learn, but now can't he just not go anymore ? Not give the pink dude any attention and just let him do whoever he wants??