ML does in fact have 3 "concubines" when he and MC separate. It's not clearly stated whether he actually slept with them though. The reason he had them was because his Master gifted them to him after said Master noticed him staring at a 17-year-old boy (similar to MC's age appearance). I mean, even if he slept with them, it's whatever to me, honestly. If protagonists can have harems, why not the harem members themselves? Double standards, I tell you.

Oh and MC doesn't die. That other review was a bit misleading. It's the MC of the novel within the novel, "Immortal Love". I wouldn't say the death was meaningless, per se, because it was meant to show how scary the big bad villain is... he turned out to be powerless in the face of censorship though, so. I guess you could write it off as comedy? Yeah, it's a little contrived. The author could have spent more time building up to those scenes, but it is supposed to be a short story.

they do get to be intimate, even if the scenes were merrily skipped over in the spirit of real-life censorship.

At first it was very funny. Then towards the end, it became stale (I cannot find a good word to express myself). Doesn't feel good at the part where MC meet with ML again, it sounds like ML has slept with 3 other boys during that period.

The ending part is kinda short for an ending. Like what?! The villain died already? And oh, the way the supposed 1st ML died is also kinda rushed.. though it makes sense his status has changed to become a canon fodder. The author tried putting many elements in but he/she ended each of them with one-two sentences every time.