You Have Me in Your Heart

Fang Muyou accidentally falls off a cliff and is pierced through the chest by a longsword, unexpectedly forming a contract with a vicious weapon.

He isn't some kind of monster. What kind of look is it to have a sword sticking out of his chest!!!

Xing Ye: Look, I'm stuck right in your heart. That proves there's room for me in it.

Fang Muyou: Kindly get out of my heart, now.

Xing Ye: Pull me out and you'll die.

Fang Muyou: ...This is so infuriating...

[PS: A slightly flirtatious, murderous weapon gong x a sharp-tongued, fiery, enchanting shou.

The title is exactly what it sounds like.]