
Spoiler:
Ooh the overall story is the same, seth killed osiris in order to usurp the throne. Isis revives the former. Horus, osiris's son tried to reclaim it back and a huge war ensued between the two. Before that seth was sexually attracted to horus, so when the latter asked for some strength from him, seth proposed that they have intercourse. During the course of the war, Seth overpowered Horus and violated him and it was a sign of his indiscriminate sexuality. He continued this for a long time. He tried to come inside Horus because it was considered poisonous and he wanted to weaken him and probably kidnap him and keep him by his side forever but it was disrupted.
Spoilerish
What is really interesting though is that in ancient Egyptian mythology, it was Seth who violated Horus and not the other way round, in fact it was Seth all along who desired Horus and wanted to have him under him, he was not at all innocent and had no redeeming backstory at all. He was just way too ambitious.