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So, Hiromu was raped by his dad. It was raining when his dad tied him in their stable and let the horse rape his son why he put his ding dong on his son's mouth– basically having threesome with the horse. So when his younger brother told him that their dad lover him, Hiromu snapped. His repressed sadness and rage made him vent it out to his younger brother that's why we can see him 'raping' his younger brother after saying 'what do you know?' when younger brother said that their dad loves him. Hiromu 'raped' his younger brother to show what their dad's love is but younger brother actually nows what happened and said 'I'm not raping you, I'm not Dad." And then asked what he wanted. Note that this is happening as it rained, thus the title. Although, we did not get to see what Hiromu's wish is after younger brother asked what he wanted, we can deduce that he wants to 'die' so he can be freed...that's what the last panels are.
For short, its fucked up.
![](https://pic1.mangapicgallery.com/r/avatar/15/u1041151_50x50.jpg?2)
During old times, Eunuchs were castrated, meaning their scrotum will be removed. Some died since the medicine back then is not that great, while some lived for some time but died from infections or complications. Eunuchs are not considered as male nor they are female. You will see some historical texts and illustration of some officials having sexy time with eunuchs. Since their scrotum are removed, they gradually became *feminine*. Eunuchs sometimes wear rouge, perfume and other cosmetics. The reason why they are castrated is to prevent them from having any affairs to the emperor's harem (prevent them from having any thoughts towards the emperor's women/men).
ML: *wants the author to continue writing cause he want to be closer with his baby*
MC: I'm...I am the author!
ML: Win win.