We have a known error with the inventory that will be fixed in the official version, but you only need to access your inventory to see what you have. To start reading the book, just go to your room in the evening after you’ve picked it up from the warehouse.
In addition to what Will said, you don't actually need to click on them in the inventory or anything. After purchasing the book and getting the option to start the photo shoot at the warehouse, go to your room in the evening and choose to read the book when the menu pops up.
I go to the kitchen in the evening, talk to Sidney, and she tells me that she's really busy trying to finish some designs; haven't gotten to any costumes yet.
This looks like you may have tried to install the ipatch yourself? If so, delete and download the game again. The ipatch that is already installed is only for this alpha version. No other version of the ipatch will work.
The only thing I have running is the scrips bugfix. I reextracted all the same, just in case I did try to. In any case, it still turns up with both red light and green light.
I do see a few Landlady and room mate comments being said even with clicking patch on and some of those sayings it actually shows up top the person who is speaking is Mom. So no real biggy. 
$ mandyanger -= 2 should be $ cousinanger -= 2.
Found the shower problem. This one hadn't been reported, so thank you for your help! If you ever see landlady/roommate stuff, and you're sure the patch is on, let me know what the sentence said, then I can do a search and fix it.There is one were Jacky/mom is getting busy with the shampoo bottle/bum in bathroom and the very end scene/squirt it shows Sidney squirting and MC even says, thanks Sidney. Just a small fyi for yas
You're right, this one hadn't been reported. I found the problem and fixed it, so thank you so much for reporting!
If it was 0.05a than the bugfix won't work for it, and the ipatch isn't pre-installed. But I'm going to guess that you meant 0.06a in which case I'm not sure why this is happening. I only know that DS's new patch (which will come out with the official version of the game) will hopefully take care of the problem. And if it doesn't, the only suggestion I would have would be to delete your persistent save data. Sometimes when a bug manifests itself and then gets saved, you can't get rid of it until you delete the persistent save data. If everything goes right, the official version could come out today.
If the book is in your inventory (don't check, or the inventory icon will crash your game until the official release) than the only other requirement to trigger the scene is that it's a weekday. You can't read the book on the weekend.