
No, Kou did also care about Yuu finding out, both Kou and Ginga did. In the side story anyways. But now they’re all together and they don’t care as much anymore since they all love each other.
I kinda feel icky knowing their love happened only after they had sex to get over Yuu at the time, but it’s fine cause whatever, they’re all together now. It seems like they both love Yuu the most regardless, but I’m glad they at least also love each other rather than just two loving one only as you said.
I wish Author showed Kou bottoming and more of Ginga/Kou sex or sandwich between all 3, it sucks they didn’t add that.. I wonder why they only have Yuu receive in the main stories.

Kouetsu was a top, so I didn't see him bottoming. But that would have been interesting. And we had seen a sandwich with Yuuzen in the middle, though I wished to see a sandwich where Ginga was in the middle. Are there any more extras? I don't think so, as it was completed. Hopefully, we will be able to see new works from the author because his/her other works are also amazing.

Ginga was also a top, but he became a bottom as well, so I don’t see why Kou can’t. I want all of them to be seke that’s gonna be hot. Kou in nurse fit bottoming. I have seen that yuu sandwich but we all want Ginga sandwich or Kou which is unlikely.
And nope I don’t think there are more but I hope so.
They have a unique art style I like

Yes, I see where you are coming from. Maybe because of the art, Kou did look like a bottom but I like juxtaposition, when you see a character whom you thought was going to be a bottom but he was top, or vice versa. Yuuzen (super bottom), Ginga (vers), & Kouetsu (super top).
All these terms I learnt from a gay youtuber. Lol. But all I'm saying is, there are people you only like to top just like Troye Sivan .
Ginga and Kouetsu didn't commit any crime, so relax. All of them are in relationship, so it is okay if they are sleeping with each other unlike other threesome where only one person is loved and other two become co wives. I also believe that Yuuzen also knows something about their relationship cuz he himself witness the kiss between Ginga and Kouetsu. It is just that Ginga don't want Yuuzen to know that he is a vers(seke) cuz of his insecurities and he also thinks that somehow Yuuzen will look down upon him. And Kouetsu, I don't even think that he care whether Yuuzen knows about his relationship with Ginga.
I like the story because you don't really see in a threesome relationship that all characters love each other. Its usually MC falls for 2 guys and the other 2 be like, fine, whatever. So it's kind of refreshing to see both MLs also love each other.