I'm going to advocate for some more content for the solo/sneaky? route.
Joseph is passed out on the couch on friday if you give him the whiskey. Why not have a scene with Anna while he's there passed out?
Have a blanket during the TV watching to get playful with Anna while Joseph watches his show.
Have more scene(s) like the wednesday event where you have 'visit' and Joseph almost catches you.
Possibility to rewrite some dialogue/add to it a bit to make some of the scenes spicier on the solo route. E.g. when you go to the dresser and Anna asks Joseph to get out so she can talk to you, then immediately gets on her knees => have MC confront her 'Did you just send out Joseph just so you could taste my dick again Anna?'
You could have some scenes where you brag to Adrian about your new GF and show him some pictures of Anna (without the face in them)
Honestly there is so much wasted potential there. Maybe it would be an idea to have it be a 'selected' route rather than just the state of 'Joseph & Adrian haven't been told... yet.' Then you're locked in to the route and get specific scenes for it. Currently it just really sucks that there is basically no scenes at all exclusively for the (still) solo route.