The person you love is older than you. He's seen storms and sunshine, and people have died a hundred times over for him without regret. Some have turned into demons for his sake, while others have promised to meet him again in another life. He's already had people cry, laugh, fuss, and go mad alongside him. The past has faded like clouds and smoke, love and hate have passed before his eyes. So what makes you think you can make him open his eyes and fall in love with you all over again, pining for you and turning you over and over in his thoughts?
1) Calm, scheming shou x fiery young master seme
2) Younger seme. An alternate-universe fantasy setting where people can easily live for hundreds of years.
3) Every time the plot takes a big leap forward, the seme wants to grab the shou and demand, "Tell me, teacher, just how many good older brothers and younger sisters do you have?"
4) I'll come back to write this after finishing Beyond the Bounds of Science *^-^*
Theme: Don't let the past hold you back. Embrace the future.