First of all, I want to say that this is a beast novel, Danmei.
The receiving one is Jin Yu, the attacking one is Bai Jin.
As everyone knows, most male birds don't have that, and many only have vents. It's OK to release the penis when it comes into contact with the female bird.
So most birds are quick shooters.
I'm just saying this to tell you, there's no meat.
This is a normal beast, not a human beast. .