
for having sex part maybe it can be seen as how much Kael doesnt give a fuck with those two and wanting to give a passionate love towards Hestia. but for me... somehow he kinda buttering her up before bringing this ykno or maybe im missing some part but as far as i remember thats what i see(or read)

OMGG YESSS the sex part was so important because it was right after Diana apologized to him. Kaelus seemed desperate for sex because he was shocked that he didn’t care about Diana no more and realized just how important Hestia is to him instead. But then Hestia misunderstood it as kaelus maybe still having feelings for Diana and he wanted sex to forget her

It should be this link
https://moonlightnovel.com/for-my-derelict-favorite/fmdf-chapter-32/
For the current ch from the manga it starts at ch 32 from novel
they cut so much scene and dump it in one chapter makes me disappointed as novel reader. (not also the fact, in novel hes and kael is having sex twice before and they didnt put it here..)
im actually literally waiting this part because I love when the author portraying of how much Hestia feeling despair and angry towards him tho. like betrayal with her feelings and her reason to live and here we are only got in one chapter.. damn..