...SOMEBODY?!

Yeah, this one confused the heck out of me.
I don't think he was actually fucked by his father's horse; I think that was just the nightmare he kept having after he got away from the father who abused him.
What happened between him and his brother was more confusing. At first it seemed like he was going to assault his brother, but then his brother appeared into it and ended up topping him.
No matter how you look at it, that's one totally bleeped up family.

If he didn't get fucked by the horse why's he ask about it at the funeral(?) thing?

& I get that he has a shit-tastic relationship w his family but I don't know if he was dreaming that he & his brother had sex or if they actually did because it had a really confusing ending that made it hard for me to track what happened & what didn't ya know?

I thought he was dreaming about the horse raping him because it was symbolic of his father, who apparently treated the horse a whole lot better than him.
To be fair, that might just be my wishful thinking because I hate the idea of him having nightmares about being raped by a horse a whole lot less than the father actually training his favorite horse to rape his son.
Plus, I'm not buying the logistics of the horse rape. Horses are a lot bigger than people, so even if the horse was inexplicably aroused by a human tied to a post, I believe the horse would be more likely to beat the poor kid to death trying to mount him, than to succeed.
I thought the brothers having sex was real, but I'm still not sure about the ending. In one of the last panels it looks like the brother with the dark hair was about to strangle the kid with glasses to put him out of his misery, which made me wonder if the upside down umbrella was meant to symbolize his death
Basically, the whole thing is open to interpretation. I would really like to hear the author's view of what did and didn't happen, but I'm guessing that would be hard to come by.

Yeah the logic of bestiality in general just doesn't add up but ya know how in manga pretty much anything goes? I think that's what this person did, but I don't actually have a clue either....I only know of a couple authors that base their manga on reality, reality & not manga reality.

But thanks for explainin the rest. I think I can focus on it a bit more--the story line that is.

Thank you for your thoughts.
It's nice to know that I wasn't the only one with questions about what the heck did and did not happen.
This one was super hard to follow.

Yeah, not sure what the mangaka's goal really was there... (￣∇￣")

The one thing I did get was that the brother called to tell the MC that the father had died BEFORE the father's actual death. So it seems like the brother might have actually killed the father to get the MC to come back.