@sozobe,
First, I guess you have "I'm the adult here." Actually, I was damn shocked by the destruction of your garden, then the running, then the WHISPERING thing!!!! We'd NEVER have done that!
Then, you likely have "If you guys can't work it out, we need to not have the next play session."
About all you have then is stopping the play time, and calling their mums.
The no threesome thing is damn good, methinks.
Guns are likely somewhat excessive.