Fake love...to true love? (MuTan) Father/Son Relationship

Chapter 1

  In this situation, Tanjiro was as good as dead. He had no idea where he was. His hands and legs were bound up by chains, and he was blindfolded and gagged. Right next to Tanjiro was most probably the strongest demon in the whole world. But Tanjiro did not struggle, which was strange for a slayer like him. This was because it had been Tanjiro's own fault. Sort of his own fault.

[FLASHBACK]
  The Hashira were having a meeting in the dead of the night because Upper Moon 3, also known as Akaza, was killing too many slayers. The Hashira had to make a plan to trap and kill him. Tanjiro, had to drop by after being beaten up terribly by Lower Moon 5, Rui.
  "Can't believe Basketball Head (Akaza) is that strong," commented Rengoku.
  Everybody chuckled.
  As the Master was about to wrap things up, four familiar demons blocked the exit. They were Upper Moon 2 (Douma), Upper Moon 1 (Kokushibo), Akaza, and Muzan Kibutsuji, the Demon King.
  The Hashira gasped. They all took out their katanas. But the Hashira found out they could not move because of some spell Muzan cast.
  Tanjiro was standing nearby, shocked. Despite his injuries, he took out his katana and charged towards Muzan. Muzan grabbed hold of Tanjiro's katana, but surprisingly, the blade did not cut through Muzan's flesh. Muzan snatched the katana away and looked at Tanjiro.
  "Are you Kamado Tanjiro?" he asked.
  Tanjiro could only nod.
  Muzan's lips formed a cruel smile as he said, "Well then, I've come to offer you a deal. As you can see, I have hexed your friends here. But not only does the hex stop their movements, it can also blow out their brains at my command. You want to save them?"
  "W-what will I have to do?" asked Tanjiro.
  "Oh, not much, just come with me," came the reply.
  Tanjiro's brain was now a tug of war. Part of him wanted to save the Hashira. Part of him wanted to save himself.
  Muzan returned the katana to Tanjiro.
  "If I don't receive the answer by dawn, your friends are dead." he said.
  Then, he and the Demon Moons stood at the exit.
  "If you're coming with me, then go to the exit," Muzan added.
  My instincts are screaming at me to decline his offer. But 9 dead Hashira. For 1 slayer. This wasn't worth it, thought Tanjiro. He started to walk towards the exit.
  "Tanjiro! No!" shouted Giyu Tomioka.
  Tanjiro stopped and turned his head. Giving a soft and sad smile, he bid his friends farewell and continued walking to the exit.
[END OF FLASHBACK]
  Tanjiro could only hope that his sister Nezuko, whom he loved so much, would be safe.

Please enjoy the story and tell me what you think of it.