We're back with the regular "ThiS iS NoT CoNsEnT" BS again.
I don't know who are reading this story, but clearly there is a lack of clarity is what consent is. FL had consented to sex and yes she was initially not very into the extra rounds of sex, but NOWHERE in the story will you see her complain about that (her issue with the ML is the actual non consensual "mark" thing and never does she ONCE in the manga or WN will she say that she had been R***d or anything that implies lack of consent.
Occasionally your partner might want to try something you might not be into at the time, but then you indulge them- that's fucking consent (if she didn't want it, she would have TRIED to push him off/ cussed him out/ attacked him or SAID something. Also, Japanese has that weird thing where they say "dame" which is not exactly "no" (but gets translated as "no". It's more of a "this is no good" in the sense of them being overwhelmed etc etc. I'm sure most people here would know that- but needed to clarify it.)