[Egon mulls these questions over, squeezing Venkman's hand gently. He then weaving his fingers between Venkman's.]

Well, I don't claim to be an expert in human emotional states, but I'd imagine he'd be...bewildered, first and foremost, then complain about the amount of bug-like creatures crawling about. Then, most likely eventually settle if he realized other Ghostbusters in this dimension, or, if he did not realize as such, would attempt to return to his dimension repeatedly. [He pushes his glasses up the bridge of his nose.] As for our relationship, he'd probably be surprised and then make a crude remark on dating habits or any sexual topics with juvenile humor.

[And then, after another few seconds of considering this--]

Why?