Summary: 

Six years ago, Wei Wuxian was driving back to his hotel following the best week of his life. He'd met a man, an alpha he wanted to stay with forever. No one accounted for a truck, slamming into his car. No one accounted for him waking up, unable to remember the name or face of the man he'd fallen in love with. No one accounted for the baby, growing inside his belly.

Six years later, Wei Wuxian, famous musician, is spotted with a child. One thing leads to another, and suddenly, Wei Wuxian is swept up in a whirlwind of confusion and hope.

Maybe he won't be alone forever.

Link: Time Takes Over, May We Do It Again - Katana_Pistol - 魔道祖师 - 墨香铜臭 | Módào Zǔshī - Mòxiāng Tóngxiù [Archive of Our Own]

Note: The setting of this story is in A/B/O universe. Wei Wuxian is the omega and Lan Wangji is the alpha. Wei Wuxian is the member of Lotus Pearl band and the very heart of band. But that's not all. He is a single father who dotes on his son although Wei Wuxian had forgotten who the alpha was with whom he had his child. There is angst, drama, romance, misunderstanding and at last a happy ending. Make sure to check this one out.