Played several times and still am not getting ANY ending. Used your walkthrough but after "a few day later" H-scene, I get a repeat of "a few days later" again and again and again. Tried Domination and Yandere routes - they work but never goes to an actual end scene.
Arrgh! Even went back to original file and am not getting the end scene!
After all that, I went to original file then your final file and deliberately failed to get a second scene. Got what I thought was end scene and then game over screen. Turns out text says she returned to normal (no further H).
So I guess if you get one of the endings it is supposed to loop? None of his later games is like that. There is always some final message.
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Aside from that, I found some typos:
"Does it feel got to wake up with your lover on top of you<3" (lover ending in response to face look)
"got" should be "good"
"We're brothers, do you understand that?" (Talk) "brothers" should be "siblings"
"Did you think i coul've messed with you because i liked you, Oni-chan?" (2nd response to "You want to believe that you like me." & "You kept doing it, now it's too late"
"coul've" should be "could've"??? and "i"s should be capitalized.
So, Oni-chan, how was coming inside your little? It was the best right? (After 1st cum - I think Yandere 2nd day.) "sister"" left out after "little".
That's all folks.