Still just reaching, I know, but if anyone was even mildly interested I had a plot bunny hopping about in my head.
It's a few years after the events of the movie. Barbara and Adam were rewarded for recapturing Beetlejuice with the ability to move on to their next plane of existence. The Deetz's have moved back to the city, having had their fill of the country, but leaving a now 'of age' Lydia behind in the home she now loves.
The sleepy community of Winter River seems to be changing, and Lydia is worried, noticing patience wearing thin amongst neighbors and a since of foreboding in the air. She can practically feel the crackle of dark magic around her, and knows something ill is about to befall everyone. Unfortunately her hands are rather tied without any link to the Neitherworld anymore, so she does what she feels she has to.
Not having seen him in years and not having any idea if he's still around to be called, but lo and behold he appears and she has to try to make a deal with him in order to gain his help in combating whatever it is that plagues Winter River. And what does Beej want? Why to be married of course, and this time he isn't taking any chances.