The Seductive Voice of Money Made on the Side

An original work about compensated dating.

Miyuki is a big-breasted, prim-and-proper looking high school girl with a short haircut. Her body is that of an early bloomer that's still not finished growing and she lets it be disheveled with some well-lit sex in exchange for money.

(Source: Melonbooks)

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[Note: This has 2 near-identical versions, one is the original doujinshi, the hardcore version which has black bars; the other is a heavily censored softcore version, published by Night Comic; The covers are slightly different but the story is the same.]