I found a way to get around this. It's quite easy to get around luckily:
- Download the trail version of "RPG Maker XP", click "open project" and navigate to the "Curse of Pleasure Alpha 0.8" folder. Then use it to open the "game" file.
- When you've done that, go to "Tools"->"Database". This will open a new window.
- In this window, go to "Common Events" (should be the second to last tab). (You should now see a list of events on the left, and some code on the right)
- Click on "Common Event 001", as should be the "Clothing Check (Default)". (Once you've clicked on it, you should see a bunch of code on the right, and above that 3 fields: "Name", "Trigger" and "Condition switch")
- Set "Trigger" to "None", press apply in the lower right of the window, then press "OK" to close the database window.
- After that, press the "Save Project" button, and play the game.
Now you shouldn't get the "I can't walk around like this" pop-up, so you can interact with the father. After you're back at your house (aka the first place you can be fully clothed again), save the game, and do the exact same thing you did to disable the clothing check, except now you should set "Trigger" back to "Autorun". Then just save the project again, and you're sorted!
I haven't tested if this would result in bugs, but I highly doubt that it will. And even if it does, you could just copy over the newly made non-bugged save into a new copy of the game. Hope this helps!