The Painless Weapon & The Guilty Noble

She cannot feel pain. A seal was put on her to keep it out, and it took most of her other feelings with it, which is what makes her useful to the people who use her as a weapon in their revenge. She has no way to lift the seal on her own. The man she is thrown together with is a noble whose house has fallen, still in line to inherit a business group, and worn down by guilt over something in his past. The two of them are caught in the same run of ambushes and betrayals and stay alive by staying close. His gentleness is what starts to loosen the seal, and each of them ends up spending their own life to fill in what the other one is missing. Her strength goes into keeping him alive through the succession ceremony tied to his twenty-eighth year, where the contest over the inheritance turns deadly.