I don't really think this is good as the other ones but I hope the idea was written properly. Sorry if it's short!
Alastor never understood what devotion truly is, those couples promising each other their body and soul in matrimony, their gazes soft with love, and hands clutching each other in a gentle embrace. He never grew up in a devoted household, his father abusive, refusing to show even an ounce of love to him and his momma. Though perhaps his momma showed devotion– to Alastor absolutely, but he never thought of that as devotion, but more so love, and his momma loved him to death.
Devotion to him at the time meant to give everything he has to the person he loves, but he never found the one that he does. In life, swarms of ladies would flock to him, begging for his attention, he would give it to them, but only for a moment. That's devotion, yes? Those ladies willing to rip each other apart just to get a chance with him? After all, they were willing to give everything to him just to let them call him theirs. Yet still, to him, that was not devotion, but merely infatuation.
In death, no sense of devotion can be seen in hell, every demon is too selfish to give themselves to each other for the silly notion of love. Souls here are not meant to give out because of love, they are meant to be used and controlled for ownership, that is not devotion. Both in life and death, he did not have any hope of even experiencing what it's like to be devoted to someone.
But now as he gazes at you gently holding the chain connected to his neck, looking surprised at how you were able to claim the soul of an Overlord, and not just any Overlord, THE radio demon's. Moreso, he couldn't help the purring coming from his collared throat, knowing that you own him now, and he would never, ever leave you.
He kneels in front of you, head tilted up and ears drooping down, his tail wagging quickly, hidden within his long coat, his smile dopey and in so, so, so in love.
He crawls slowly towards you, hand gripping at your thighs, slowly creeping to wrap around your waist. You own him now, evident to the soul you hold oh so gently, he can feel it you know? How soft you are at handling him, you could be as rough as you want and he wont complain.
He looks up at you, pulling you closer to hug your waist, the chains heavy, but his heart light. Your proximity and warmth sending shivers down his spine, pulling out a shaky breath from him.
A heavy blush covers his whole face, his smile growing wider, huffing and puffing as he smells your intoxicating scent. He leans his whole body against you, body weak at how he is surrounded by you, your scent, your warmth, your gaze, and just… you.
What true and utter devotion truly means.