UMMM well i rarely think about touken ranbu nowadays (i am super duper late in answering this question) but well you know.... you know (you dont know) maybe like. um. i feel like magoroku would be casual to yasusada but yasusada is like. quite aloof? oh help me. IT'S JUST. I CAN'T IMAGINE IT RIGHT NOW their closest interaction would be yasusada saying "horses have cute eyes" offhandedly while they were on horse duty together and magoroku going "that's something coming out of you" yeah! i have no idea what this means