Good boy. Hold that shit in front of you and look at it, give it a little squeeze in your hand, feel its warmth in your hand. From now on you follow my orders whilst holding a handfull of poop. If you drop even a tiny bit its game over, you have to clean up and go home and I'll tell all my friends about this. Think you can do it? Lets see...
Start stroking with your other hand. Lets see how much you enjoy wanking now.
Can you still smell the panties on your head? Well hold that shit close to your face. Get it close to your nose but DON'T get any crap on my knickers! Good, now take a nice deep sniff. Let the smell of my panties and your turds intermingle... maybe this will put you off sniffing dirty underwear in the future!
Keep on wanking and sniffing for a couple of minutes...
....
Okay stop jerking now. That glass isn't full enough. I wanted you to fill it. Is it difficult to piss with a hard-on?
I want you to smell that shit until you get completely soft. That shouldn't be too difficult...