Ruki- He would be gentler, but strict. He wouldn’t allow you to eat much unhealthy food and he wouldn’t let you sit on the couch all day. He might engage in a few ‘activities’ if he learns they can help.
Yuma- He would let you sit back and relax, and would cuddle you and be very sweet and nice. If you become a total bitch on your period though, he’d leave you be a lot and would just ignore you.
Kou- He would spoil her rotten with gifts and sweets and make her feel like a princess~ Of coarse, she would owe him once her period was over.
Azusa- He would let you eat whatever and would basically cuddle you the whole week and kiss you all over and make you feel loved~