While I am that 8TB, I am not related to him, so your guess would be as good as mine would be.
Part of the reason I like Immoral Desires is because of my intimate relationship, for lack of better terms, with Kuroneko's work, Oba-san no Karada ga Kimochiyo Sugiru Kara. The archetypes are pretty much the same, that is, Daniel and Kousuke (Ko-chan) are two peas in a pod. Both series reflect an Oedipal and Male Power fantasy. Both Kyouko and Lana are the older, incredibly busty, pushover maternal objects, who are often dominated sexually by their younger male partners. The difference is that Kyouko and Kousuke are aunt and nephew; furthermore, Kousuke is blackmailing his aunt into having sex--though, the implications of this blackmail are quite soft, given that it's clear that Kousuke has no intention of actually causing any trouble for his aunt. When translating the work, I made sure to highlight the differences in their speech where Kyouko is more formal and polite, and Ko-chan is more rough and nonchalant. I think their speech lends well to their diametrically opposed attitudes and sentiments on sex. I just wished Immoral Desires reflected a bit more of this as well.
Katherine from Mandologica's Forbidden Flames curses a lot, but the difference here is that she's a character who's been established to have a bad temper. It actually lends itself well to their interactions because it provides more nuance when she "softens up" during her interactions with her son, Ben. Lana stating, "what the fuck?" and "Yes, Yes, Yes, I feel like a slut, and it feels liberating,"? I understand wanting to convey her letting loose, but why is she talking like that? Surely there are better ways to word her "liberation." But who knows? Maybe it's just I. I grew up in a time when children didn't curse in front of their parents, and parents spoke with a certain sophistication. If Lana wasn't slated as some "morally upright" character, I probably wouldn't have much problem with it, in the same way I don't have a problem with Katherine's speech. But Daval did set her up with a particular demeanor, and her dialogue has done little to nothing to service it.