Looking forward to Iris' breakdown when she hears the "news". Looking to be epic.
I doubt it's going to be a "breakdown" or certainly not openly anyway. Erynn is totally unaware of Iris's crush and just thinks that she is her friend. I suspect that Iris will have to somewhat pretend to be happy, while also being a bit heartbroken. Though like I said before it would be funny if Iris said to the MC "Is it bad that I want her even more now?"

It would be quite an Iris thing to say IMO.
Nyx says alot of stuff tbh, I prefer to see what she does rather than what she says. Because more often than not they are very different things.
I think Iris will just be happy, and do that "somehow i always felt this connection to you" and say she just misinterpreted her protective feelings for attraction.
Maybe with some incest jokes sprinkled in because Nyx can't help herself.
About John doing all this song and dance about introducing a girl to her father... "hey Erynn this is your fath... oh never mind he's dead" would be a peculiar choice.
John: "Iris's mother isn't around, but maybe you should try completing the set and go for Melissa too?"
MC: "Well, about that..."
Yup
Joking aside I think it would be a bit strange for John to now play the overprotective dad to Erynn so soon after finding out, they are still strangers essentially. Being even more determined to help her out of the Ethan situation is one thing but trying to tell the MC what to do in terms of romancing Erynn is another.
I could see it as a "Iris has more feelings for you than you know, so be careful with her heart." Especially if you chose to fuck her in the last update, which was pretty obvious, he's not stupid. The whole garage would smell like sex, also how Iris is afterward.
John was very hands off when it comes to the MC and Iris, still is.
I would expect him to be similar when it comes to Erynn.
The one thing that can make him rise up and put the MC against the wall is if he is fooling around with both Iris and Erynn, i can see John coming up and saying "this game you are playing with my daughters is gonna hurt them both and i won't stand for that", and ask that you be honest with them.
If you keep your distance from Iris in the present, he has no reason to say anything about MC and Erynn, just like he never interferes with MC-Iris.
Iris has to be considered a Main Girl, to be honest, especially with extra narrative story and extensive background she has been given. Be a bit weird if she wasn't.
I agree, with all her background and long connection to the MC she's built for more than a quick fuck and creating tension for other routes.
Nyx creates so much story and connection for her side characters that is natural for them to become mains.