Okay so I found this from someone:
“ Okay listen up. Kou & Ginga officially did have sex before the main story. Someone also pointed out in Ch.8 Pg.26 that it's hinted they did do it. There's 2 Extras (Below I will include links & details)
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https://www.cmoa.jp/title/152580/ This is the Single Chapter Version, the 2 Extras are listed on Pg.2. Ginga is on the cover to the extra were both of them had sex (Kou x Ginga)
https://www.pixiv.net/en/artworks/76545901 Here the Kou x Ginga extra on Pixiv
https://www.pixiv.net/en/artworks/76756382 This is the other extra on Pixiv (I have no idea what this one is about, sorry)
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https://www.cmoa.jp/title/170053/ This is the Book/Volume Version. Vol.2 says it has the 2 extras which is only available digitally so im assume the physical copies don't have the 2 extras (FYI im not 100% sure if Vol.2 (digitally) has it or not since I haven't brought it)
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https://www.cmoa.jp/title/188036/ This the Single Chapter Version to the SEQUEL, it doesn't have a Book/Volume Version since it's still currently ongoing
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https://www.ebookrenta.com/renta/sc/frm/item/140547 Official English to this series
https://www.ebookrenta.com/renta/sc/frm/item/141968 Official English to the Sequel
Anyway I hope this helps :)”
Yeah sorry (〜 ̄△ ̄)〜 I just meant that Yuu was the common denominator for them and that it’s not that Kou and Ginga were particularly fated to be together (In my head it looked like Kou was fated with Yuu, Ginga with Yuu and Yuu with both, but not Kou and Ginga with each other). But it looks like they are all fated because the alpha pheromones became compatible :)
Ohhh that’s what I thought tooooo; the fated pairs are yuu + kou and yuu + ginga, where kou and ginga are basically the same pheromone-wise (tho idk how to feel about how they shared so many cells that they became super compatible)
But sorry too I was re checking my comment to you after posting, and it came off as a bit mean
I think that the two alphas are fated pairs if I remember the first story correctly