I would tie his hands above his head attached to the bedposts, then strip him naked, then take his legs up above my shoulders and start sucking his balls and dick.
I would flip him over, the tie his hands to the bedposts. I'd strip him and put a pillow under his stomach so his ass was up. Then I'd rim and fuck him
lock him in a pillory for the sexual and other cruel pleasures of me, all the other guards, and his fellow condemned, then taken to whatever execution he will face to die in shame and pain.
well.... the first thing is to suffocate him with a pillow, for sure he'd struggle for a while... but at the end he'll pass out.. then I'd fill the bathtub to put him into it... pushing his head underwater to finish the job... maybe he'll wake up when underwater and probably he'd make more little struggles.. but after about 1 min he'll be out and drowned.. So I'd hold his head underwater for about 5 minutes more to be sure he is not kidding me