Yes, but you still aren't going to touch his cock

You stand up over the quivering demon, enjoying his desperation to cum. You have an idea of what to do with him, but you are unsure if you can get it to work. You look down at your crotch, focusing hard on what you want to happen, just like the demon instructed you to when you summoned the leash that you're now clutching. Then you snap your fingers, and sure enough, a long and thick shaft materialises on your pubic mound. Two balls plop down like little weights below it, and you run a hand along it, stroking the skin and sending a few waves of pleasure through yoour body. Even more fun than a regular strapon, you think to yourself.

You tug on the leash, pulling your demon upright and into a standing position. His stiff cock bounces and quivers, his excitement making you smile.

"Lie on the bed, on your back, legs spread." You instruct him, He does as you say, silently, and you follow him so that he doesn't choke himself on the leash. Once his postion satisfies you, you climb onto the bed with him, kneeling between his legs and stroking your new cock, making sure it is stiff and hard, and that he knows what is about to happen. His big green eyes look at you in a mixture of anticipation, desperation, and slight unease. You lean over him, sliding two of your fingers into his mouth and making him wet them with his own saliva. You feel his warm and wet tongue sliding over your fingers, toying with them as if they were a cock. Then you pull them out of his mouth, sitting back on your knees and pressing your now damp fingers between his cheeks, rubbing them over his asshole. You massage the wetness into him, lubing it and relaxing it. Occaisonally you slip two fingers into him, and he lets out a little wimpering moan as his cock twitches. Once you are satisfied, you spread his cheeks and press the tip of your new cock to his wet hole, slowly but firmly pushing inside him and splitting and stretching his asshole. The incubus moans loudly, his cock flexing as his legs tense up. You grab his thighs and push deeper inside him, spreading his hole wider until your new balls are pressing against his cheeks. You hold there for a moment, slowly gyrating your hips and rubbing your cock against his insides. You seem to hit the right spot, and a gasp like moan escapes him and his cock spurts hot white cum over his chest. His ass clenches around you as he orgasms, pleasuring you greatly, and you start to fuck him, forcing him to orgasm over and over again. He can do nothing but moan and grip the bedsheets as you thrust in and out of him, his untouched cock quivering as it dribbles cum and spurts it over his body.

"Such a good boy." You tell him as his flow of cum starts to subside. "You need a reward." His big eyes look up at you, looking curious as to what you count as a reward if not his orgasm. To answer him, you grab his hips, pulling him down onto your cock and making him squeal. You feel your own orgasm release as you bury your cock inside his ass, pulsating through his hole as you pump it full of cum until it starts to drip from his asshole.