Sokka (ATLA).
In a world where the avatar never returned and the fire nation took over, Katara was eventually found to be a bender and imprisoned. In a desperate bid to try to get her out, Sokka stumbled his way into working at an exotic male only brothel that catered to fire nation soldiers.

He spent many months taking medicines to alter his figure and perfecting his skills so he could become one of the most prized boys in the brothel and attract higher ranking soldiers, to convince them to release his sister. While he hated the job at first, he had grown to enjoy it and was starting to become hooked and worried he would forget his goal. All he wished for today was to meet a high ranking soldier to earn their graces and get a good orgasm in as well.
Unfortunately, he got only got one of his wish granted.

In the middle of their session, the high rank commander grew annoyed with Sokka's blatant disregard of the commander's needs in favor of his own personal pleasure. The commander's cock was just so good and fat that Sokka was too distracted bucking his hips up and down on it that he failed to notice the commander reaching back for something.

Just as he could feel himself climaxing, Sokka began to let out a moan that was swiftly cut short as a sharp pain suddenly hit his neck and the world began spinning. When the bouncing and rolling stopped, Sokka's mind was filled with a mix of pain, pleasure, and horror as he looked at his erotic, headless body still slapping its ass cheeks aggressively on the commander's thighs. For a few moments it continued bouncing before his body finally slowed and slumped over on on the bed. As his vision faded, he watched the commander go to the door and call out something, but whatever it was he would never know. The tidal wave of pleasure that had flooded his mind overtook the pain in his mind when the brothel's attendants arrived to clean up the mess and apologized to the commander.

Sokka's fellow coworkers, who had spent many a passionate night together with him, were both horrified and aroused as they looked upon Sokka's curvy hips thrusting and splurting a few more loads. As his rod twitched and dripped with still hot juices, his empty eyes almost looking hungrily at it, his moist tongue flicking up and down instinctively. They picked up Sokka's still twitching and cumming remains to place down in the basement while they cleaned the commander's room for the next unlucky soul to cater to the commander.

His body continued to jerk and buck and cold on the hard earth when he was joined by another cute, headless boy a short time later, their naked twitching bodies jerking against each other breaking the silence of the basement with the occasional rustle and sticky dripping sound. After the days work was over, the rest of the brothel cleaned the two up, spent a few more hours giving them both a "proper send off" and filling them with "parting gifts", before taking their corpses to the incinerators.