This is one of those yuri manga where there is a guy but either they only act as a comedic character but also someone who is also a wingman for the yuri pairing..Like Seifuku no Vampiress Lord and Why Did I, the MC Of Gal Game Jump Into A World Of Yuri Comic..Honestly, guys in yuri manga doesn't bother me so it's fine..Besides, even got the feeling that the brother thought that he is pushing them to become friends with each other but also accidentally making them fall in love with each other.. :D