she later elaborated on what happens if the heroine were to get 100% with either reynold or derrick and it said it was familial not romantic. vinter, eclise, and callisto would've given romantic love confessions but that wasn't the case for reynold and derrick. I went back and found the page that she talked about it so here.
https://www.mangago.me/read-manga/death_is_the_only_ending_for_the_villainess/uu/mpn_chapter-2299489/pg-2/
[explaining how reynold's/derrick's route would differ in relatance to penelope..so spoiler]
reynold would've been a brotherly love so there isn't change there...but derrick is little bit more complex. derrick has romantic (more so obsessive) feelings towards Penelope so his route might've not been brotherly love had she reached 100% for him. There's no way to know for sure but since his feelings for her were there...it's would've changed at least a little. This is also the reason for his abuse towards her. he's "liked" her since they met and his feelings manifested as hate...and thus began the abuse. He was obsessive (although not as obsessive as another capture target that shalln't be named) and wanted to keep her caged up. So yeah take that as you will but bottom line is that in normal mode...they are both familial love but in hard mode, reynold would've had no change but derrick's would've most likely changed.
yw <33 & dw there's no incest. derrick is just a crazy mf but penelope never entertains that thought. even reynold and the duke diss him bc throughout the story bc he acts a mess. some ppl like to argue that they're not blood related but like the duke adopted her which makes it incest. but once again you have nothing to worry about in regards to incest.
I’m a little confuse here, let me get this straight.
According to Penelope, the pink guy and the young duke are the heroin’s older brothers. But both of them are the capture targets ?