You have some good points, but you are also missing some of my points.I really enjoy these "dress-up" potraits, lots of fun.
On the whole "Jenna is spending soooo much time with Emily" question, Jenna had already spoken with the MC about corrupting Emily while he did the same for the rest of his willing "partners." That was not going to be an overnight accomplishment.
Yet, we are seeing benefits of that approach already, as Emily volunteered to the MC that he could have sex with the other young women with her blessing - it came in large part from her experiences with Jenna. And, that is also bringing out an apparent bisexual urge in Emily which she apparently never knew about before, plus Jenna seems to enjoy it a lot, too. Remember, the MC didn't get Emily's open agreement on "sex with everyone" until the past release. We are seeing not only a "harem" setup in motion, but even more bisex to go with that, too.
This investment in the various pairings should begin to show dividends for all of them in the next episode, IMHO.
The conversation with Jenna and the MC was, that she would seduce Emily to make her agree to threesomes with the MC, so later in one of that threesomes Jenna would fuck him to see Emily's reaction. That's what they talk in the game in the harem path. It is also a good way for making her accept the harem and be a part of it, if she sees threesomes in a good way, she will be ok with sharing him and would want to be a part of that sharing. Right now she fucked Jenna, tried to fuck Sofi and Emily tried nothing with Elly, Jenna was the one fucking Elly not Emily.
They could have tried to do a threesome with the MC after he catches them in the massage parlor, but Emily prefers to fuck Jenna to even try anything with the MC, in fact since she starts fucking Jenna she seems to don't even want to try anything sexual with the MC and for a woman that says that she loves the MC and that was 12 years without dating because she loves the MC, not trying to do anything with him and instead go to fuck his sister is a bit dumb.
All the other girls in the "harem" knows that there are others and they are ok, the only one that need some convincing is Emily. She gaves her permision to the MC to chase other girls in the house, she didn't say anything about joining them for a threesome, foursome or something, so while she gave her ok, it was more a way to cope for her feeling bad about fucking Jenna all alone while the MC in her head does nothing (not even with her because she isn't even looking for him when it comes to sex). Not because she is ok with sharing him and wants to be a part of the harem, meaning doing things together, she does it because she feels bad.
If we talk about Jenna in the harem path it becames even dumber, she in the first day that arrives, goes and fucks the MC in the first momment that she got, she says that she is in love with the MC since lot of years ago, she married a guy just to pretend, because she loves the MC. But again like with Emily she doesn't tries anything with the MC since the massage parlor, and she knows about the MC fucking around so it doesn't makes sense that she didn't try anything with him, then when he is in the hospital, you would think that a crazy girl in love with the MC like Jenna is she would try to at least be with him, but nah, she visits him, stays a few mins and go away.
The thing I dislike more about Jenna and Emily is the huge change in their personality, I mean they are presented in the first versions/days as two womans that love the MC too much, I would say that Jenna loves him even more than Emily all things considered. But then they have sex and it changes them from being in love/wanting to be/spend time with the MC, to be too busy fucking each others to even care about how he feels or if he wants to expend time with them, it's like they care more for each other than the MC, sexually speaking.
When we came back to the house and now that the MC has permission of Emily and that Jenna knows it too, Jenna should be trying to fuck him the momment he steps trought the door, because right now Emily can't say shit, at least I hope we get some sex scenes with Jenna in next version, because if we don't even get them with Emily agreeing to it, then I don't know what kind of harem this is.
But anyway, I won't be losing more time writing post like this, I just wanted to vent a bit, that way people won't have to read me saying the same things over and over again hahaha.