xcalibar4, you make some good points through the use of images/dialogue from the game. Some of the points you made were ones that I previously was trying to make by highlighting certain dialogue from the game, though I think your points may come across stronger with the additional use of imagery.
The main point I agree with is that the FMC initially tries to make it out to be that she is getting excited by what she's doing because she wants to fulfill her partner's kink; however, if you really look at her internal dialogue (her thoughts), it becomes apparent that she is doing this more for herself. Also, like you said, if this is more for the MC, then why is the FMC repeatedly doing things behind his back or without his permission first? And this is only on the cuck and sharing paths, where it can be somewhat justified (taking initiative, I suppose).
However, it makes even less sense on the sexual modesty/faithfulness paths and on the cheating paths, as I previously tried to show through the use of a detailed recounting of some of the decisions and dialogue along those paths. On the sexual modesty path, although Emma will never have intercourse with Martin without her husband's permission, she still will share several inappropriate moments with Martin and tell the MC about none of them, which may include giving a Martin a handjob while licking the tip of his dick after modeling risque lingerie for him. On the cheating path, Emma just totally goes off the rails after discussing fantasies with her husband, and even if he sends her porn involving one man and one woman and tells her that the porn she shared involving two men and one woman worries him, she still will have sex with Martin; and if her husband does not continually check on what she is doing, then she repeatedly cheats with Martin both in Martin's home (twice while her husband is in bed!) and at her and her husband's new apartment (while her husband is helping to move into their new apartment!), again with the only way to avoid some of this is for the MC to continually check on her (in other words, to not trust his wife).
I find this progression to be extremely fast and out of character for the FMC, especially given that she is married, still has passionate sex with her husband (who is in good physical shape), has never had sex with anyone but her husband, is satisifed with her husband being supportive of her university education (and does not feel seriously wronged by her husband in any way), and supposedly begins to fantasize about having sex with other men because she thinks it excites her husband and thus wants to please him. Yet regardless of her husband's actions, she will twice snoop on Martin while he masturbates in bed, and if the MC does not interrupt her while she does it the second time, she will witness Martin calling her name as he masturbates and apparently likes it so much that she decides to conceal it from her husband. Lastly, on the cheating path (the most immoral path), the FMC does not show any evidence in her thoughts about her behavior bothering her in terms of her conscience or in thinking about how damaging this could be to her husband's feelings and their marriage.
