Hard to Part, Hard to Let Go

After being retired for a long time, an assassin who never dared meet his master's eyes crosses paths with him once again. Emperor master, gong x stoic, long-suffering shou. An alternate ancient setting. The master is a thoroughly ruthless emperor gong, a little yandere. The assassin is a stoic shou struggling through a sea of darkness. He's steady in temperament, not expressionless. You could call it a beautiful gong and strong shou pairing. The assassin struggles for a while, then they have a sex scene, and they fall in love while having sex. Enjoy.