Love in Reverse: An Accident Binds Me to My Childhood Friend

(No Chi Guo pairing, so don't read if that bothers you. Childhood sweethearts + two alphas + 1v1 + both are scumbags + marriage before love + dog training. Possessive, controlling, dark top × unruly, flirtatious bottom.)

Chi Cheng wakes up after a drunken night and discovers that he slept with his sworn enemy. He chain-smokes several cigarettes.

What is this supposed to be? Rivals turned lovers? Sworn enemies turned lovers? Or childhood sweethearts turned lovers? And on top of that, he marked him.

(Jiang Xiaoshuai and Wu Suowei aren't mentioned. Not one normal person here, including the author.)