The husband's arc was kinda interesting with the woman seducing him and slowly finding their compatibility, realizing everything was planned and bailing out after the terrible mistake trying to redeem himself being a good father and husband but the danger of temptation still lurking around. Meanwhile the wife... for god knows what reason she is the owner but suddenly she is not because of some convenient shit that would never fly. She could have easily fought back and ruined the NTRman but no we gotta progress inorganically from now on. Also the slimybag douche got a literal implant, like what? Why? It feels so fucking cheap of him using that instead of slowly breaking her. Needless to say they also have the worst sex scene so far. Wouldn't be surprised if with his mecha penis now he is also going to fuck the labgirl too.
Man, way to drop the ball this series just too good to be true.
Not denying your overall opinion but technically speaking the "mecha p" only functions for the wife because it's shaped based on her data. If he were to do it with the labgirl he would need to get the surgery a 2nd time for a high match rate with another person