I am the only one who didnt understand nothing in the end?

Basically the uke was a big fat liar who seduced the seme to get the sheeps. The uke might be the wolf/coyote or something even worse

The plot is Dennis being tested by God. His story parallels the one with Even and the garden of Eden.
The test is choice between obedience to God or self willed desire.

Boss-god
John- apostle
Dennis-parallels Eve. Is gods follower.
Todd-devil
Sheep-symbolize innocence, purity, gods followers