Crossover, Trinity Blood/Final Fantasy VII, Abel/Tseng, "He needed to be claimed by someone strong."
It wasn't often that the Head of Turks took a lover. Once in a while he'd visit a place under the plate to scratch an itch and that was about the extent of it. Tseng was one of those types in constant control, always thinking, planning, plotting, and generally trying to keep a measure of sanity and order in a world that wanted to dissolve right into anarchy. He wasn't a lover. He was something like a bionic wolf strapped into a man suit and set on 'organize'. When it came to relaxing, he'd last paid token thought to the concept sometime around birth and promptly dismissed it as a hindrance to survival.
So taking a steady sex partner upset the order of his universe a bit, but he adjusted. Abel wasn't particularly intrusive, although his very existence and penchant to get into the oddest situations left Tseng with even more paperwork. The man was considerate, accommodating, and the sex was fabulous. They ate together, talked, and fucked each other through any steady surface that could handle the abuse. Tseng didn't mind being a blood donor, and the scattered scars that collected on his neck were evidence he enjoyed the sharp, stinging sensation almost as much as Abel enjoyed his meals.
They didn't really talk about roles, switched places as often as they liked, and were almost freakishly comfortable with each other considering the rampant paranoia on both sides. Abel was afraid of being found out and hated, feared or used. Tseng had Rufus to think about, and his fellow Turks. His reputation could hang itself but the Turks would never loose face because of his actions, public or private. (Although, with Reno, it was hard to say what amount of face the Turks still had)
Still, as time went on, things shifted between them. Abel shared bits and pieces of his past and Tseng, a few shreds of honor still clinging to his soul, revealed a few of the parts that came before the Turks and things labeled 'Need to Know'. The collar wasn't the start, indeed finding the exact start of the change would be hard, but it was the first permanent claim. The scars were nice but didn't count in Tseng's book since he wasn't exactly the only donor Abel had or even needed. He was just the one Abel fucked while sinking his fangs in.
Little by little Tseng gave up his tension, his constant wariness and control when they were behind closed doors together. He gave it to Abel and Abel responded the same, letting more and more of the Crusnik out to play. So there was a collar, worn under the blue suit of Shinra. Later there came a tattoo, over Abel's ribs and shoulders in a tangle of white, black, fresh blood red and jade green. A black wolf circling a white tiger, threads of red fate tying them together around the single character of eternity.
They didn't discuss safe words or experience or boundaries. Tseng led, Abel followed, and somewhere after giving up the last shreds of his heart, he gave up what he wouldn't give to Shinra. His pride, his control, and his faith. Abel's commands were soft, gentle, his punishments rare. He was a good master.
Tseng never fought being claimed before Abel, there was simply no one strong enough to take him and keep him the way he needed to be kept. Abel had no intentions to ever let him go. Tseng was pretty alright with that.