Older sister finds a bottle of suspicious liquid near her bed after a bath, leaves it alone, goes to sleep and wakes at night being enveloped by the liquid and finally she changes into succubus. After demonization is compelete she goes after her younger sister, rapes her and turns into succubus as well. And then they cuddle. HAPPY END.
Link:
https://www.dlsite.com/maniax/work/=/product_id/RJ320293.html
twitter:
https://twitter.com/keipakupaku8989

嘛……剧情和设定还是挺在我xp的
但是画功已经让我想要哭泣了

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Alpine forgot "And then they cuddle".

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ooooh!this is 2006.

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@MitchellTF
lol, Done, as you asked XD

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