If you like the artstyle and want to read a full story (2 Seasons) by the same artist, read "This Witch of Mine".
It isn't a Shojo, but has an absolutely fantastic story!
Just to clarify, the Emperor is female, the concubines are male and I don’t think they have some kind of ‘unsavoury’ relationship with the child MC, at least I hope not cause the novel is not finished yet, I think.
Emperor is a woman who treats mc like a proper child don’t worry, even in her pov for the “first night” she’s like “I DONT WANNA TOUCH A BABY AND I LIKE ADULT MEN ANYWAYS!!!”