He missed the obvious way to get out of being pranked - become a marauder. I love that he got Remus. Very well written.
You got it, well done.
Remus was impressed to start with, but unfortunately Harry failed when he caved too soon because of his panic over being embarrassed in front of the girls. He really needed his Gryffindor side to have taken over if he wanted to avoid getting too pranked too much. Remus would have given him a break out of professional courtesy.
Lunch isn't over yet, so I wonder what'll happen next? :)