It occurred to me that if Fujino is planning the ending of "Happy Cuckold", then so far there are a number of mutually exclusive paramaters. Kirito sees the example of Klein and the Priest in front of him. Alice and the Priest's wife fuck with several men, Fujino also said that apart from Inoda, Asuna will not fuck with anyone. It's problematic for such an ending. Inoda also hates Kirito and wants Asuna to be his pig wife both in the game and in real life, but if Kirito is a cuckold, according to the rules Asuna must be Kirito's wife and Kirito must voluntarily share with Inoda. This is impossible for Inoda, he wants to get rid of Kirito. So what if Fujino is planning to do the ending of "Happy Cuckold" (is he planning to?)then you need to do several actions.
1. Kirito must fully return Asuna's love.
2. Kirito must expose Inoda in front of Asuna
3. Kirito must get rid of Inoda
4. Kirito must inspire Asuna with the idea of other men.
And then the ending "Happy Cuckold" may turn out, for example, there will be final scenes where Asuna "works" in a church or fucks with someone in the RECT toilet.
In short, the Inoda and the ending of "Happy Cuckold" are incompatible
From my understanding of the story and the way in which the creative process of Fujino works there will be a "Happy Cuckold" but not in the way we might expect.
It's clear that the story suffered some changes from the initial premise which was set out. This change coincides with his work related trip where he took a break from developing the game and focused on fleshing out the story and potential endings. Here a discussion can be had if the change was planned all along, but Fujino lacked the inspiration, or it is a new idea that came to him.
Up to the previous update release, the game story was following the classic trajectory for a NTR game, and we could make educated guesses on what the potential endings and story flow might be. Asuna, Kyoko and Liz being conquered by Inoda, Kirito becoming a loser and running to America, Sinon and Suguha becoming Hebishima playthings and Alice becoming a toy for Fukushi with Klein on the sidelines. And I think Fujino also knew that following this trajectory will not require much creativity and in the end just put his game on the same tier list as other in the genre.
With the changes done to the story and character relations, I am suspecting that Fujino is trying to subvert our expectations. Proof is the sudden friendship relation between Sinon and Asuna and the one-week time skip done after Asuna and Kirito relation got more leeway from Kyoko. Hebishima removal from the story together with Sugu and Sinon relocation to other roles in the story. All this indicate that Fujino is trying to route the story in a new direction, while at the same time trying to conceal the outcome/endings in a complex web of conflicting goals and motivations.
My theories for the possible game endings, if the development of the game keeps the same momentum and Fujino retains his motivations for working on this game, are as follows.
1. NTR ending - Kirito only finds out about Asuna cheating with Inoda at the end of the game. Kirito breaks down and decides to cut all ties with Asuna and follows his dream of studying in America alone. In this ending, Kirito does not find out about Kyoko relation with Inoda or about any other actions that Inoda may have had with other characters.
2. New relationship ending - this ending follows the same premise as the NTR ending. What is changed is that Kirito upon finding about the Asuna Inoda relation, he decides to leave Asuna and get in a new exclusive relationship with someone else from the female cast. Liz or Sugu are the only candidates for now. Remains to be seen what are Sinon feelings towards Kirito.
3. Polygamous relations / "Happy Cuckold" ending - Kirito finds about Asuna cheating and decides to accept it with the condition that he too will get another partner besides Asuna. Kirito will have to choose one between Liz, Sugu and Sinon. For this ending to work, Kyoko relationship with Inoda has to stay hidden from Kirito and also Kyoko does not have to know that Kirito is having another partner. Here I am thinking that depending on the person chosen by Kirito and Kirito stance on being a cuck the girl that gets in the polygamous relations can still have sex with other people behind Kirito back or be open about it. One example is that Kirito gets Liz as his other partner, but Liz is also fucking Inoda behind Kirito back. We know that Fujino is also playing with this idea and also Kirito had a dream where Liz is servicing Inoda. While this might not fall exactly in "Happy Cuckold" ending, I believe this is the closest we can get to it with the limitations that Fujino put in place for Asuna.
4. Kirito cheating ending - Kirito finds about everything, not just Asuna and Inoda relation. Here I am taliking about Kyoko relation with Inoda, Liz relation with Inoda, Sinon and Suguha past relation with Hebishima and their subsequent actions. Upon Kirito learning about all that is happening or took place, he decides to still keep a formal relation with Asuna and make her think that he is in the dark, while Kirito is having sex and exploring all his options will all the girls Liz, Sinon, Sugu, Alice. In this ending, Kirito basically becomes a man whore, and he tries to have as much fun as possible.
These are the endings that I could see happening. Then again, these are just speculation and Fujino might decide he will just end the story with a cliché ending and that will be that. I myself hope to get more endings, and the endings that I am most invested in are 3 and 4. Endings 3 and 4 offer the most creative freedom and most satisfying end to the game in my opinion.