Hello, it seems that using "Beg" against certain (or maybe even any) enemy before Rabbit Succubus forces the defeat scene. Try loading save where you didn't use "Beg" skill at all.
Worst case you might have to restart... hopefully not that bad since she's the first boss.
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Fatalus is correct. I got to the rabbit house, then used 'beg' when I fought Dark Succubus. I beat Dark Succubus, but when I fought the rabbit, it was a first round KO and I became the father of dectuplets. What a nightmare. By using 'beg', I did get a loss scene that I hadn't seen before.