Sex between the three of them was crazy, uninhibited and downright nasty at times. There were the rare tender moments where their bond would show through but mostly the trio ended their trysts sweaty, bloody and torn, gasping for breath and tasting each other on their tongues for days.
About three weeks in Kurama's bed broke and the other two really didn't know how he managed to explain that mess to his mother considering that pieces of the headboard were charred and broken and the mattress was leaking springs. It was then that they decided to move their sessions to the forest, or to Yusuke's apartment, or to any place that they deemed safe from prying eyes. They stayed far away from Genkai's temple; Hiei visibly shuddered when the thought came to him that they might be interrupted by his virtuous sister and, after a night in Alaric, Yusuke swore he'd never set foot in that centipede again. Hiei agreed, but Kurama secretly knew that the jaganshi got off on Mukuro watching them. In her defense she had only stood there a few minutes before clearing her throat and asking Hiei if he planned on resuming border duties later that night. The jaganshi hadn't even stopped thrusting as he told her to fuck off. Yusuke, on the other hand, was so mortified Kurama thought that he was going to have a stroke. Once Mukuro left it took several minutes of deep-throating to bring the Toushin back to his current state of hardness and after that the door still got more attention than Hiei's cock.
It didn't take much convincing on Hiei and Yusuke's part to ask Kurama to find an old den, trade some of the treasures within it for human currency, and purchase a small house for the sole purpose of a fuck safehaven. They had done sillier things for worse reasons. Unfortunately, in less than a month, Hiei was bored of same seven rooms and started to move things outside. After that, Kuwabara's visits became less and less frequent especially since Hiei declared that it was his territory and he could walk around naked if he wanted to. Although the impressive sight of a nude jaganshi bothered the occasional unannounced guest, Kurama and Yusuke had no complaints; in fact, Yusuke sometimes hid Hiei's pants before visits to Makai.
As the years passed the three became kinkier and kinkier adding high-maintenance toys, dangerous spontaneity, and sometimes a fourth to their midst although the new member never stayed long. Koenma kept throwing his back out, Yomi wasn't interested unless Kurama maintained his Youko form, and Jin - after a long sabbatical with the trio - decided to become boringly monogamous with Touya. Females were out of the question, as were normal humans. Kurama was afraid Hiei would break them; he wasn't a gentle lover and the last time they asked him to ease up the walls needed to be replastered.
Their perverted commitment to each other outlasted all of the relationships around them as well as most of their friend's life spans. And yet sex between them always remained hot, wicked, and downright insane, with a few brief reprieves of tenderness when their bond would shine through, strong, forged through metal and time. They were never bored, they were always sated, and that was enough for them.