What to do, what to do?

Up until a few minutes ago, I was sitting here working on Haunting. It occurs to me that the story is most likely going to be shorter than Craving, mainly because I don't have to fool around with too much back story and introducing the main characters. Craving ended up being just under 63,000 words and I'm sitting at 25,000 words for Haunting, and I can tell you I'm probably going to be wrapping it up in another 10 - 15,000 words. I already have the third installment planned out (if only in my mind) and I'm beginning to think I need to combine those two stories together into one book. I don't like the idea of maybe having to come up with unnecessary filler just to fill out two separate books.

If I decide to combine them, it would mean Haunting would just be a sequel to Craving, and I'd be breaking away from the trilogy format I originally planned for. Now, I could still expand the Willow Creek Universe by dreaming up some other adventures for Sabine and Remy later on or writing about other vampires, shifters, whatever that may be linked to the area somehow. I'd love to explore the character of Gretchen a bit more, and I'd like to go back in time and write some shenanigans Remy partook in before Sabine. These would all fall under the Willow Creek Vampires Series, though I may need to tweak the name a bit.

I have time before I need to turn my manuscript over to my editor, and I'm confident I can get everything banged out in time. It's just a tough decision to change course once you've decided where you want to go. I am well aware this is probably just a late night rambling, and I could very well wake up tomorrow and think of a whole other direction to take the last installment and decide it has to be its own book.

I don't know. I guess part of me just wants to give my readers more bang for their buck, and I feel bad if Haunting only ends up being a 2/3 the size of Craving. However, if I combine, then Haunting could end up being way longer than Craving.

What to do, what to do?