Consensual(ish) knock out

Anyone know the best way to knock out someone? The fantasy is drug him, fuck him on camera, and show him when he wakes up. He agrees, too, just don't know a good way to actually DO it.

Sorry for my english...there is a way but its not for a long period that he will be passed out. Warning: Do this on your own risk. We did this when we where younger for fun, first look for a safe spot to fall down! make him crouch (hope its the wright word) and let him stick his arms out in front of him. Keep this postion for about 20 to 30 seconds. Then let him stand up fast en make him blow on his fingers. He will pass out for a couple seconds and you can do what you want... but really quick. Good luck!

Drugs, chloroform, partial strangulation, a blow to the head? That’s got to be highly risky, unless you have a personal electric chair or lethal injection fetish. Even if it works, your mate won’t get much enjoyment out of it, other than watching the video.
Better to persuade him to act unconscious. It’s a real challenge for him not to react to whatever you do to him. His cock will give the game away, of course, and the contrast between his limp body and his stiffening erection will make the video more entertaining.
Hope you can share some pics?

Ambien and wine, and you are mine.