It is 3some. I think they meant to say that it’s not a throuple or a poly relationship.
3some - 3 people having sex or are in a sexual relationship.
Polyamory - “the act of having intimate relationships with more than one person at the same time.”
Throuple - “a relationship between three people who have all unanimously agreed to be in a romantic, loving, relationship together with the consent of all people involved”
So all 3 of them are sexually active with each other but not romantically. That’s probably what they’re trying to say.
I mean, the two of them shared something like familial live for each other. They are really good friends. So it’s not like there is nothing there. Also, the term threesome just means (in a sexual context) three people having sex. Whether that be all equally, or like this where it’s one partner for two people, it’s still a threesome. On top of this, I think they are genuinely a throuple (three people in a relationship is a throuple) because they care for one another, but the love they have for Chika is contains lust, whereas the love they have for each other is more familial.
except their sex life, actually their relationship isn't threesome? because two men love just one men and one men love just two men separately i mean it's not like three of them love each other KSNSKANKSKWJQ doesn't it makes sense