The door opens to a naked man in a chastity cage. My client already seems to have a slave, so why am I here? 

"This way." I rise and follow the slave, his cock straining in its small cage, his balls swollen and blue, as if he hasn't cum in any way for a long time. We enter into a bedroom, a man in a dressing gown smiles as he sees us both and drops his gown, his slave quickly moving to pick it up, gently hanging it up, quickly kneeling at the end of the bed, as his master walks up to me, his cock hard and ready. 

"You hungry slave?" Understanding and knowing what is wanted of me I lower down and begin to stroke his cock, sliding my lips over it, tasting his cock, my own straining in its cage, part of me wishing that I could feel such pleasure, but I haven't been unlocked in so long, I've began to forget what it feels like to be able to touch my cock. My clients slave stares at us, a hunger in his eyes, I guess he is thinking the same thing, at least I get to cum when fucked, he seems to not even get that. I imagine being fully denied, how much pain I'd be in, nothing but endless frustration, far worse than what I already experience, satisfied with cumming when fucked as I focus on giving others the pleasures I'm denied, it makes me grateful for what I have. 

My head is pulled away from his cock and I look up at my client desperately, seeing how my life could be I crave his cock even more than I usually would. He pulls me up and throws me onto the bed, I rest on all fours and lower my head, raising my ass invitingly. I feel my plug roughly pulled out.

"Keep this warm slave." I open my mouth and suck on my plug, tasting my ass and letting out a moan. My plug muffling my cries as he forces himself inside me, his cuckold slave watching, his eyes full of desperation and longing but he never moves or protests, his eyes also showing something else, a hunger and lust, while his master is fucking me instead, I moan and suck as he fucks me, moving my hips in time with his thrusts, pushing him deeper and putting on a good show for his cuck, making sure to make him jealous, adding to his longing and denial, something coming over me as I want him to know what he is missing, knowing what he needs and desires, just like me he wants to be locked away, to be denied, he wants to feel the ache in his balls, the resistance against his straining cock, the feeling of every crushed attempt at an erection, the feel of cold metal every time you reach down to play with yourself, he knows that he is a sub, that he doesn't get to be hard, he doesn't get to fuck, his role is to bring pleasure to his master and get his pleasure from theirs. I look at him while I moan hungrily, enjoying his master's cock, my own straining hard as I reach the edge, his desperate face full of frustration and denied lust sending me over the edge, I moan loudly into my plug, cum shooting out of my cage, my client cumming hard inside me. 

I breath hard as he pulls out, his slave immediately beginning to hungrily suck his cock clean, now I suppose it is my turn to feel jealous, for a second they look at my and give a knowing smile, both of us aware of how much we are tormenting the other, two slaves used against each other for the enjoyment of our masters, and we both love it and in doing so deserve it. As he finishes I try to imagine the taste, my own tongue having to settle for my plug. I watch as his slave climbs onto the bed, a look of humiliation on his face as he moves his face towards my used ass and begins to lick it, cleaning up his masters cum, I moan as his tongue enters my ass, moving deep inside me, making sure to get every last drop of their delicious cum, my cock twitching in its cage as I feel his tongue moving around, knowingly making me horny and desperate just like him. 

Finished he climbs off the bed, his master climbing into bed and wrapping his arms around me as he takes my plug and slides it back inside, his hands gently caressing me as we lay together, his cock going unnoticed and ignored. Their master leans in and kisses me passionately in front of him, this was only the start of our long night of fun together, one his cuck is forced to watch, his cock straining while we both forget that he is in the room.