I really really think that because of Shuraka's mommy issues as shown in chaper 20, he was probably just trying not to kill anymore concubines (probably because his mum wished so),after killing his mother's friend (?). Thus,he inherited his father's harem along with political 'gifts'(more concubines) from the nobles or sm. I do agree with the theory that pink hair gave sex ed. class to him,by using himself as an example(please be just anal masturbation only by pink hair himself or sm).And with the theory that pink hair manipulated shuraka into spending the night by saying he's inexperienced and Tei will be disappointed in him.
This novel has a manhua?! Whoaa I've read the novel in like 2018 or 2017
So that is what going on it explains why I’m always waiting for the next episode in like 10 maybe 20 years sometimes at a time.