Responses
I doubt they'll both join him, if anything I think the non cat girl who was his only friend in that party might try to go with him. She'd never been so betrayed by the "hero" but that chapter 12 looks very active in dialogue wish I could read it ╥﹏╥
Spoiler:
http://www.otakuscan.net/MangaDetail/650/kouryakuhon_o_kushi_suru_saikyou_no_mahoutsukai_meirei_sa_sero_to_wa_iwa_senai_oreryuu_mao_tobatsu_saizen_ruuto
Magnus defeats a dungeon' boss whilst the hero flees with the nun (in her defense, she was grabbed) abandoning those two left-over-last-ones-to-fuck to be almost raped (I will admit it was nice to see them in fear) and then magnus saves them. After the boss is defeated they both hug him.
I truly hope they won't abandon the hero's party and try to go with magnus. I hate those two. Magnus deserves better.
Just look at what they did to the dwarf and many other things. Even if they weren't the assailants themselves, they did let it happen and even smiled while watching it. They are garbage that deserved to be murdered there. Minus Points for Magnus for saving them.