There is more to the context. They've had sex before but the chief only inserted partway. This was their attempt to get the bottom used to his full length so that is why it hurt and that is why they kept going. Personally I think he should've let him have a break but I like tender semes, still Idt this is as rapey as your summary comment makes it out to be.
I see a difference between forced sex/rape and rough sex imho the author intended the latter with this couple but that's just my opinion based in the context and art.
By comparison, this looks like rape bc of the horror on Louis' face.
https://www.mangago.zone/read-manga/who_s_your_daddy/uu/br_chapter-24013/pg-1/
This sex scene sucks at first it fucking hurt but he kept on doing it and after he told him to stop and he fucking continued