From the Start, I Became Shenhe, My Brother's Summoned Spirit

(Although Shenhe appears, let me make it clear that this has nothing to do with Genshin Impact. I just like the character, so it won't involve Shenhe's story or plot from the game.)

(Gender swap) (One-on-one romance) (System)

He and his buddy are hit by a truck and sent flying. He ends up transmigrating as a spirit beast, and even runs into a beastmaster who doesn't seem like a good person.

After transforming into human form, he even...

Damn it, even rabbits don't eat the grass by their own burrow.

Wait, why does this guy have the same name as my buddy?

What? You're saying you're my buddy! What the hell, are you even human? I'm your buddy!!