I kneel a watch as my master is fucked hard, his caged cock swinging and straining, a key dangling from his piercing glinting as it moves, the key to my own straining cock. 

My master is a slave, we met while he was out shopping for his master and fell in love almost immediately, we spent weeks talking to each other whenever we could and I had to be with him. I was heartbroken when I learnt about his master and his situation of being committed to serving him but he suggested an idea, one that would allow us to be together while keeping his service to his master intact. So now here I am, not even a slave, a slave of a slave, while he gets fucked I can only watch, while he changes the sheets I scrub the toilet, while he goes out shopping I'm left waiting in a small cage, when he makes a mistake I get punished. I watch as my master cums loudly, vaguely remembering the last time I was able to cum, the collar was new around my neck as I pledged my life to my master and his master, as reward my master was allowed out of his cage and instructed to claim me. I remember as his cock fucked my ass roughly and with animalistic need, one I now understand as years of denial and frustration, my ass being the first thing he had fucked in a long time. I came for the last time that night, after which I was locked away in chastity, the key hooked to my master's piercing, one that keeps his cock trapped in chastity, if I am to ever be released it will only be if he is and that will never happen, he will never leave his master and I will never leave mine, we're both willingly trapped ourselves in this situation, bound not just by our bondage and chastity but also love and commitment. 

I climb up onto the bed and bring my face up to his now filled ass, my tongue tasting the cum of our master as I hungrily clean him, the closest I ever get to sex, eating cum out of my master's ass or when he orders me to lick him to orgasm, my tongue mastering rimjobs to the point where he can cum from them whenever he needs relief, or sometimes he makes me wear a strapon and fuck him with, my own cock and aching balls remaining untouched, frustrated and denied. My master's master smiles as he watches.

"You trained your slave well." 

"Thankyou master." I hear him struggle against moans as I continue to work on his ass. 

"Part of me feels jealous, would you give him to me if I asked?" 

"Of cause sir." I try to keep focused as I listen, part of me not liking the idea, I only become his slave to be with him but my fate is no longer mine to control, if my love were to give me to his master then so be it, I suppose we'd still be together in some way. 

"It's ok, I don't want him. Why would I want someone who is lower than a regular slave. Keep up the good work." I relax slightly, he was just tasting my master, his loyalty to him will always come before me, I know that and accept it, I always have, I'm just grateful to still be with my love, even if it means being a slave to a slave, I'm just happy to be with him, my collar and chastity a symbol of my eternal love, commitment and devotion to him, just as his our to his master.