Aww, thank you so much for the in-depth reply, and I'm so glad to hear you enjoyed the game! You're right, I had a ton of fun making it. :) A few answers to your questions:
(I'm putting the After-Party achievement hint at the end - spoiler warning)
1. Yes, we will have more public DOTU pages! I just finished chapter 4, and chapter 5 is starting in the next few months. The NSFW scenes will stay patrons-only, but I will eventually release most or all of the SFW parts publicly.
2. About the novel and comic and how they fit with CWB - I actually have a devlog post coming soon about this, but I'm out of town for a few days... Here's some info to start, though:
Devoted: Merritt's Story (novel series) takes place first, and it's the story that focuses on Merritt and Belmont's relationship. (Be prepared for some high angst and heavy stuff...) All the things Merritt says at the beginning of CWB about his and Belmont's cat-and-mouse game, getting caught in the end, the evil king, etc. IS Devoted: Merritt's Story. This is the one to read if you're looking for Merritt/Belmont. Unfortunately, it's a patrons-only story, but if you can ever swing it, it's just $2 for the 300,000 words that are already written, and folks can cancel any time. Books 1 and 2 are finished; book 3 is coming. The end of book 3 lines up with the start of Demon of the Underground, where Merritt becomes an East Sphere soldier.
Demon of the Underground (webcomic) takes place after Devoted and is *mostly* Pogo's journey. We get some background on Merritt, but since Belmont has only just been introduced in the comic, we don't have context about why he and Merritt aren't on good terms. It will eventually come out in the comic, but Devoted spells it out more clearly. DOTU is only about 1/3 complete, so there's a lot of story left to go!
Cooking with Belmont (game) is what I refer to as an AU or theoretical future for Merritt and Belmont, since Devoted and DOTU aren't finished yet, so we don't know what the future holds. :) I won't give spoilers, but I will say that this theoretical future is absolutely a possibility for the gang.
3. Perfect After-Party hint: SPOILER ALERT
This is the most challenging achievement! It's in the Cook Together route, and you have to achieve "Perfect Dinner Party" in the same play-through to trigger "Perfect After-Party." Some of the choices affect the way the food is prepared and some are more relationship-oriented. The relationship-oriented ones affect the "Perfect After-Party" achievement. Bigger hint: remember that Merritt and Belmont have an enemies-to-lovers relationship, and it's okay to give Belmont a hard time. ;)
Watch for a line in the cooking scenes where Belmont smiles and refers to "...later tonight" - then you know you got the after-party choices right.