
Penelope was brought in and raised as his sister, but he never truly saw her that way. Instead, he saw her as a woman — something he knew he shouldn’t, so he suppressed his emotions, turning his feelings into what could be described as a "dangerous and suppressed desire." In contrast, Reynold came to love her genuinely as a brother would, so his affection is seen as ''naive and innocent affection."
The difference between the two brothers is so big which makes Derrick even more unlikable.

Thanks for the explanation~now I know what's going on. The feelings and stuff. Because in the last panel, derrick face looks so distraught. I was only wondering why he look like this and did penelope do anything to him or did his condition because like this because of the brainwash.
I mean even though I didn't like him at this point of time (even from the very start). I don't want him to die or get hurt.
Can someone explain the Derrick action to me. I don't think he hate hates her or what.