Tease him, make him smell your crotch

You grab his head and hold his face against your crotch. He can only smell the micture of sweat, precum and lube coming from your dick.

Stan takes deep breaths, savouring the smell while trying to tear off the straightjacket. He wants it, he wants your cock but the muzzle holds his mouth shut. He can't even run his lips over it, only feel it swell through your boxers. You push him back a bit and yank your boxers down, making your hard cock spills out.

Stan pushes forward, rubbing his cheeks against the shaft and inhaling the musky smell. He moans and groans, simultanoisly extremely aroused and denied from what he wants. You take it a bit further, and flip him over on the bed, then straddle his chest. As he looks up at your cock, you start to slowly, so slowly, stroke it. "Mm, bet you want this hard cock Stan." He squirms under you and tries to shout something, but the muzzle keeps it effectively muffled. "Or maybe, you want me to let your cock out of the pouch? Let your cock out?" Stan actually manages to shout "YISH!" through the muzzle. "Well, you'll have to earn that...