"Stick your butt up in the air."
"Not like that! I don't like it like that!"
"I don't want to ride you right now."
"It's my turn to be on the bottom. You can go on the bottom next time."
"The carpet is better than the kitchen floor. Not so slippy."
"Hold still when I leap on you! Hold still!"
Ahhh, the joys of childhood. Leapfrog is still an innocent game, and the only trouble is that one child wants to play leapfrog, and the other wants to play horsey.
It might be worth noting, though, just how much Girl Terror likes being The Boss, and how willing Boy Terror is to be told what to do, when to do it, and how it should be done.