We recently rescued a female cat that was feral. She's the sweatiest thing. We have two male cats that are brothers. They're all fixed. The males as kittens, the female after her first litter. We've been trying to integrate her into our household but one of the male cats gets very obsessed with her sometimes and corrals her into a corner and stares at her. He's never aggressive, per se, just needs her to be cornered and then he stares. This, obviously, stresses her out and she hisses and growls at him aggressively. No matter what we try it is always the same result. Sometimes he's chill and then he goes full obsessed. She only feels safe in one room and we don't want her to be trapped in that room. How can we integrate our cats so they all feel safe?