SoundWave

Please please write how to get a "Substitute" - KOKORO ending) With all her H-scenes ^__^ There also must be somewhere a "threesome" H-scene with Kokoro and her friend - a girl that she always talk by the telephone (who sleep with her Teacher). How to find it? Also what is in "When the Asure Flew Down" route? Some tell that there must be also H-scenes with Kokoro, but that is "bad ending"... Any one knows?