Responses
I think it was explained why Horus likes Seth. I believe his interest for him started when he met him for the first time, when Seth thought of him as his son when he was drunk.
^^plus
When Horus met seth in his childhood, seth showed his vulnerable side to little Horus as he was drunk most of the time.
I think it picked Horus' interest as he wanted to understand seth more.
Why did Horus like Seth so much?
Was that just the Osiris(his dad) in him
Or just flat out attraction for his uncle?