as someone who has read the whole novel, here's some big spoilers:
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dw, it's a happy ending.
although our mc ends up with ml, he gets a super devoted team (basically harem) who'll prioritize mc over everything (and i mean everything)
he also only does the snu-snu/smex/papapa with our ml
if i were to describe it, it felt like fluff horror tbh, dont worry too much
yes, a harem can mean multiple people being attached to a single person, it can be affection, adoration, love, worship, etc.
usually, harem is used for when a male has multiple females attracted to him, and reverse harem is when a female has multiple males around her
but people also loosely use the word for basically a group of people attached to one person, even if it's only by respect/camaraderie even, esp. in shipping community
in intercourse terms, you'd usually encounter gangbang, orgy, 3p, 4p, 5p and so on to refer to multiple people doing it as a group.
or the word "poly" is attached in front of a word, which can mean they are in a relationship with multiple people, may it be romantic, sexual, and so on










although it would be interesting for iruma to get taken away after his memories get erased(or suppressed), and temporarily be on another side's "team", i dont want the misfit babies to get heartbroken