I just dislike password systems because it ends up eating most of the discussion (also the timing of how it is implemented in this game seems to be more focused on cockteasing a free player into impulsively getting a subscription, instead of just being about protecting patreon exclusivity, so kinda shady).
Anyway, feedback time.
First the praise, the artstyle and the character design are great, Hana's design in particular feels perfect for this story, I also have no complaints with the writing until Yuma's first handjob session. Hana's teasing and how it blurries the lines between being accidental and on purpose is super well done, and Tatsuki is written in a way that, if not relatable, it is at least understandable. In particular, I really enjoyed the way the game went about rationalizing his kink: the pride of showing off how sexy his loving wife is, the empathic happiness of seeing something amazing happening to someone he cares about and for who he wishes nothing but the best (Yuma), and how heartwarming it feels to be able to also be a spectator of how amazing and caring his wife can be in intimate moments; all of this stacked against the almost innate angst of seeing your wife with another person and the bittersweet jealousy of getting to see how "easily" Yuma is getting to experience something amazing, something that Tatsuki ever really only had as a pipe dream fantasy in his younger years. I think this dynamic was amazingly put together for the theme of "wholesome NTR".
Now for the critiques. Apologies if they start sounding a bit ranty, just trying to be precise as I cover what I didn't like after thinking the game had a really good start.
So I started souring on the game with Yuma's first handjob session, saw the complication and the misunderstanding coming from a mile away and it essentially felt like the start of a shift to hardcore teasing fetish instead of wholesome NTR. In isolation this event wouldn't bother me, a bit of teasing in this kind of game is essential, my issue is more that everything that came after it just doubled down on it. It feels like the game got obsessed with the idea of Tatsuki getting "cucked" out of getting cucked in the way he was comfortable with, and this really starts tearing down the "wholesome NTR" idea. The later part of the game felt like it went overboard with what was essentially a constant state of stress for Tatsuki.
I think that for "wholesome NTR" to work, there are two things the writing needs to ensure:
First, the fetish can't become all-encompassing. It being wholesome means that the characters are exploring new facets of their sexuality in a way that brings them joy. If the exploration of the fetish starts deteriorating their mental health (such as Tatsuki being stricken with visible anxiety for multiple days in a row) or negatively influencing other elements of their life, they need to slow the fuck down and have a break period to get comfortable again, not double down on the fetish and increase the suffering but then act like it was all justified because "well he came a lot in the end". There's a lot of NTR games that are a constant barrage of nothing but terrible things happening, then followed by a throwaway line about how the MC was actually fine with all of this, I would not call any of those games "wholesome" because even if we buy into the "porn logic" and actually believe the character is fine, it feels more like they just think they are fine, but objectively they are closer to being crippled by their addiction to a kink that has taken control of their life.
Second, you can't skim on the rationalizations and the internalization of the developments by the characters. Remember my praise about how the game handled the start of Tatsuki's interest in NTR? I felt that was sorely lacking regarding how he feels about all the merciless teasing he endures after being transfered away from his home. It is not that I can't imagine the reasons why the teasing would be effective on him, but I think that it is important that the game is explicit about it so that we know that Tatsuki knows (or at least is beggining to learn) why he feels the way feels, rather than risking it feel like he is confused and hurt and only going through with it because "sick orgasms at the end of it though".
With all of this context in mind, I also want to point out that the sexual pacing feels weird in this part of the game, Hana accidentally sucked Yuma off without Tatsuki's consent (although he would have given it in all likelyhood anyway). Since the videos afterwards are only handjobs you'd assume Hana backed off from giving Yuma more blowjobs because of the importance of her and Tatsuki being in the same wavelength and not letting misunderstandings like that become common place since they could be dangerous. But then on the first weekend back we skip straight from handjobs to having vaginal sex, with dialogue implying that blowjobs were taking place this whole time, and Tatsuki knew about them and yet we never saw them?
Finally, my suggestion would be to postpone everything onwards from Tatsuki's first weekend back (when they first talk about Hana having sex with Yuma) by a week.
Instead have it that in his first weekend back, Tatsuki actually finally gets to peep in one of their "trainment" sessions, and if you need escalation, have Hana tell Yuma that now that he has graduated from his handjob training, she's gonna be intensifying his training by having all their sessions be focused on oral sex (all of this without consulting with Tatsuki before, both to tease him but also clarify that tacit consent is still the rule, just being more careful about being sure he actually had the opportunity to give it). Tatsuki watches their session and has a good wank during it, but also notices that while this was also incredibly satisfying, he was kinda missing the "powerlessness" he felt while watching the pre-recorded handjob videos during the week. Because of this, when talking with Hana later, Hana picks up on that he would be okay with more teasing being done even in situations where he effectively has no control and there is no promise of direct payoff for him.
And so, during the next week, Hana turns up the teasing by purposefully taking her time to respond and with very ambiguous and teasing messages accompanying the blowjob videos (with the implication that some of that was merely accidental in the handjob week). While being away from home and being mercilessly teased, Tatsuki also starts being introspective about why he enjoys this facet of his sexuality (which is different from his original NTR appreciation, since this is much more focused on teasing). I personally think a good explanation would be that being bullied like this is a bit cathartic, because to an extent he had always been a bit paranoid that, due to his meek personality and Hana's stronger personality, she always could have had her way and done whatever she wanted if she wanted to force the issue, and he would have still gone along with it. So by having her constant teasing basically "confirm" that fear he can stop being haunted by it, even though it also forces him to confront his own weakness, achieving that "bittersweet" feeling.