I haven't gone through this yet, but in the prequel ...

They're siblings. The brother's struggling to pay off their father's debt, so the sister's secretly "working" to help him pay off the debt.

Uh, that should be enough information to save people from making up scenarios in their head.

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@aurabolt
haha,you should leave some imagination space to people that can't read
some of their imagination is just too simple to the point that it annoyed you tho XD

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http://www.dlsite.com/maniax/work/=/product_id/RJ142048.html

First Part (前編): http://g.e-hentai/g/673613/0d547ef267/

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She is getting paid for this. So this is prostitution.

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Awesome, K-Ten is one of the best.

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This artist improves at a steady pace, I quite like the quality of this latest work. Looking forward to the last part.

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