An idea I wanted to try out for fun lol. Don't take it too seriously
(Y/N), a small and fragile boy, had been sold off by his parents to the kingdom, to be nothing but a slave and if unlucky enough-the queen's comfort boy.
Unfortunately, (Y/N) was one of the many unfortunate slaves to have been befallen with that fate. Attracted by the queen with his soft and feminine appearance, he is chosen as her comfort boy.
However, it was certainly no honor to be one. (Y/N) would be used and abused by the queen, whether it be through physical, mental or sexual ways. Comfort boys were nothing more than toys. The queen had no love for them, merely pleasure. Comfort boys were the lowest of low, they would even be harassed and abused the servants. They would be used until death. And in the case of that happening, the bodies would be merely thrown away somewhere, never to be remembered again.
Such tragedy was exactly what (Y/N) had to go through until his death. In his final moments, he wished he could've truly lived..until suddenly, he finds himself reincarnated in a world where martial arts rules all! After climbing to the top in such a fierce world and reaching the peak, he is suddenly sent back to his original world in his original body, right before he becomes a toy. Although returned to his original body, his world-breaking strength carried over as well. With his monstrous power that he attained in that world, he will not be a slave this time. Fight on, (Y/N)!