[Egon hums along, closing his eyes and allowing himself to think back.]

Well, back at the firehouse. And in Columbia. And during undergraduate studies....

[Habits repeated throughout their lives. He trails off, lost in thought. After a moment or two, he opens his eyes and shakes his head, smirking a little.]

Strange how long this has lasted. How things stay the same despite changing so much. [A beat.] In a good way.

[He lightly squeezes Venkman's hand, wrapping his arm a little tighter around his partner's waist.]