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You obviously have no idea what you are talking about. This guy is a multifaceted individual and you treat him like he's supposed to be a one note pervert. Not every story has to be romance or smut related. This is a story about a guy being mentally healed over time by 2 girls who really love him. I know that it's too deep and complex for you to understand the plot so I'm surprised that you even read this. Or at least some of it.
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Also, stop acting like you didn't know what you were reading.
Firstly, they are not in a relationship yet because again, the MC turned them down. Although, the girls do want to date him.
Secondly, THEY chose to share him. Not the other way around.
Thirdly, Who are you to judge the lifestyle and choices of people in a romantic relationship? Even if something like this happen in real life and they all get together, it makes them happy and they have the right to do that.
And finally, Since it is them that want him to be with them both and it would be an agreement with each other, it wouldn't be cheating.
And thus, he's not scum. If you are jealous then just say that.
bro is gay