You use him for your pleasure...

You undress and mount Markus, sliding his cock up and down your asscrack. "Now, you are my ****, my servant, my fucktoy. And Your only purpose is to give me pleasure. Understand?"

Markus nodded and bucked his hips, he was **** for release. But instead of letting him penetrate you, you slide of him and re-cuff his legs so that they are bunched up. You then place the tip of your dick at his asshole. The suit has a built in condom at the asshole for just this sort of situation.
You press forward, feeling Markus initially tense and then relax as he recieved his Masters cock. He groaned and moaned until your hips touched his buttocks. You then started pounding away like a madman, taking him by surprise.

Markus thrashed around as you used his ass for pleasure one, two, three, four and finally for the fifth time. You slumped down on Markus, exhausted. He was desperately clawing for air, the two small nose holes didn´t let him breath as much as he needed.

You pulled out and re-cuffed him in a spreadeagle position, then snuggling up next to him. "Sleep ****, we´ll have more fun tomorrow."
You quickly fell asleep...