I have the solution in two words:
Nanny-Cam
If it's works in catch a Equadorian shaking up a kid, it should work in getting a pic of your little brother's hot history tutor...
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba