You were invited as a guest on the concert. You've only performed in one of the songs ofcourse.. but it was still an amazing opportunity and it's not like you weren't friends. Any excuse to get out of the house, honestly.

During one of the specific performances at one of the "best venues" in America, of all places that would be packed full of people.. people kept posting about the undeniable tension that was placed on stage. There were subtle touches, the notice of specific lyrics being pointed towards you, and ofcourse back to back singing. That was only when you came out from behind stage on surprise, but you had a solo during this song, and his actions during said solo has fans screaming in both shock and "I told you so" to their friends

You were near the front of the stage, singing your part, feeling the song heavily in your body just like any loud concert would. And then his little background vocals, before subtly slipping his hand around your waist and lightly pulling till you were at his side, almost stumbling completely over your lyrics..-