sorry man i did as you wrote but nothing happens, i go to sleep then i assault her and fill hte good bar then i stop.You don't really need to do all that. The scene triggers if she's been sexually frustrated for a few days. You can just stop having sex with her (probably including bath-time stuff) once her Interest is high enough; the scene should trigger within a week. You can also bring Imouto most of the way to orgasm then end the session. My recommendation is to tease her nipples until the Good bar stops filling then end the session.
My stats are trust 703 and interest 847