Good game I also like that you follow mostly your own direction where/how story goes but I do believe you could make it more interesting if you included Mary in "persuading" / "convincing" the guys that it's fine or they can't blame their partners for having fun with Kendo because she herself have some action with them and I dont have here in mind that she went full slut mode and just fuck everybody and have gangbangs but she should have some soft actions atleast to keep it more interesting/surprising/entertaining just like with Yoshi blindfold scene and the purple hair guy but they were lacking they were actually to soft, they were interesting because they were unexpected and ended with a little dissapointnment because how soft they were. There is swinging, cheating already so I see no point in not using the potential the game have, you can also simply make another route where Mary is into swinging with other couples and the game would be at Ntr route(Arato), Harem route (kendo), Love route(Satoshi), Adventure route(Mary)