Nancy being busy with her studies can't drive Mike to a party. Nancy one way or another gets Steve to drive Mike to the party. It's there that Steve has an encounter with Eddie.
"I was fucking embarrassed, Steve, and by the time I realized how fucked I was, it was too late." Steve couldn't breathe for a second. There were so many admissions in that one statement.
Or: Eddie leaves for tour and neither one of them are prepared for the consequences of it.