basically, after defeating them go to the guild to inform about it. then when u go out of the guild, some conversation will tell u whether to spend some time prostituting or go talk the your friend at the town office. My advice is go prostituting first as u can get some new H-scene(4P) and then go to the office.
after that go inside your house and demon girl will leave your party. then u can enter your brothers room and get a few H-scene(got around 3 i think). after that go talk to the demon girl for some H-scene too(2 scene i think). after that get out of the house to end the game(well, u can still continue to complete the H-scene or use the new item obtained to unlock all scene)
seriously though, i still wonder why most of u still play most Japs game without at least a translating tool if u dont understand it. i mean if u just want the CG, there's lots of place for that. but honestly though, try getting some translating tool to play the game, and u'll be able to enjoy the game a lot more than u think