There was a big party happening in the neighborhood, a place where all the popular kids would be. Your little sister decided to be daring and try to talk to her crush. Since you got this message half an hour after she left, it probably didn't go as plan
Surely you would let this go on even if you became a couple. He was even grateous enough to let you come and watch the next time he and his friends has their way with your "innocent" crush.
