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Loki eyed the collar with smug satisfaction and possession. He ran his fingers underneath the soft leather, feeling the heat of Tony's skin against his knuckles where they pressed against Tony's throat.
Tony shifted awkwardly, even while tilting his neck up slightly to give Loki better access. He enjoyed the feel of Loki’s hand on him, stroking the item that Loki had chosen, had gotten made just for him. It made Tony’s throat run dry and his skin flush.
The collar was black, soft, elegant. It had emeralds studded along it and a gold loop at the front perfect for attaching a chain. Tony was wearing nothing but that choker and the ripped jeans he'd had on in the lab before Loki had called him upstairs, stripped him of his shirt and attached the collar around Tony’s neck.
It made Tony feel excited, it made anticipation run through his body and blood. It made Tony feel claimed in a way he’d only ever enjoyed when it was done by Loki.
"Mm," Loki hummed, his voice an appreciative purr. "This looks fabulous on you, Anthony."
Tony swallowed, his voice coming out a little rough. "And here I thought you liked me without anything on."
"Oh yes," he agreed, "but exceptions can be made for the right items." His fingers slipped out from under the leather, trailing along Tony's skin almost as often as he stroked the green jewels. Tony just shivered. "Perhaps I would like to see you in nothing but my colours and my claim, Anthony."
Tony felt something tingle his skin and saw matching bands form on his wrists and ankles. They felt slightly cold, but they would warm to the heat of his body quickly. They were also strong - perfect for tying Tony to the bed.
"Perhaps,” Loki continued, “I would reward you greatly for such a treat.”
Tony swallowed thickly, feeling arousal form low in his stomach and begin to harden his cock at the numerous pleasures and promises laden in that tone. "You always did make unfairly appealing suggestions."
Loki grinned widely, knowing it for the acceptance that it was and Tony didn't even protest as Loki created a thin golden chain leading from the collar on Tony's neck to Loki's hand.
From one instant to the next, Loki went from light-hearted and suggestive, his affectionate boyfriend - to his regal and commanding lover. "Kneel."
Without a second-thought and with arousal thrumming through him, Tony did just that.