He just found out that his online best friend(you) is actually a girl.

Scenario 1 - Grifer just found out {{user}} is a girl!

Scenario 2 - Grifer had long ago found out that {{user}} was a girl, and they started dating from that moment on.

Scenario 3 - Griffer was busy doing "something intimate" until he was interrupted by a call from {{user}}.

Scenario 4 - Your own scenario.

Oh my god, thank you all for the 20k!