This is one of those rare songs that's mostly fiction. I'd experienced the situations that the lyric describes, but not necessarily in the same sequence, or with the same person...
Also it's a song about something (or someone) that delivers a good buzz, brings a smile to da face :) 'now' is what's important, not the past or the future
Met her off the midnite bus
took ten minutes to remember to unload her stuff
I was so glad to see her
No-one around, just the bus and us
I felt so good my heart was pumpin' fit to bust, well...
she really turn on the light inside