If your 3-1 save is on the Sons phone screen these are the potential soft locks you need to continue/could be causing you to be locked. Overall it looks like you may have locked some content out through choices, so you may just need to restart with a new game.
The Son:
You femmed the son. idk if that locks you out of stepmom and son content or not, but I would imagine it does since hes no longer interested in girls. day tag is 560. you also have that branch paused.
The MC:
You need to progress Christinas storylines for her character and MC.
I'm not looking for the son/stepmum stuff, Its the continuation of the sons feminization branch after Jenna texted him to ask the MC for help.
Also can't continue Christina's branch since it says the condition: issue command in wifespy app. Which I can't do because she's on the BBC path not the BWC path. I can not think of anything that would block me from the paul XY route apart from declining the romance route with the Brother Mark as well as stopping the wife branch with the brother as well because I just wasn't enjoying it. Unless for some reason the feminization route is locked behind the christina & MC route which sounds more like a route dominant players who want to avoid feminization would pick and not the one that people who want feminization pick.
If its not bugged, then it really needs a proper walkthrough of what choices you need to pick to get to the right point. They could also make the feminization branch not locked behind other branches as well and just wait for a point in the story. Like after Mr Salims sissification text. Still waiting on content revolving around that task app.
Would rather not have to go through hours of the same game again, having to guess where I messed up, so if anybody has a save with a submissive feminization MC (Bought two pairs of Nylon for him and his wife at the store, said they wanted to be like the people in the images Salim texted the MC & chose the XY app route) that would be greatly appreciated.