Kemono wa Ai de, Iyasareru

As the son of the huge enterprise, Toudou, Kazuki had always been starving for real affection and the sudden appearance of Chiharu Saijou redeemed him from that miserable life. Drowned in that intercourse, Kazuki felt that there was nothing for him to be afraid of. However, one day a suspicious document came saying that Chiharu had the plan to take over the whole group. Because of that document, Chiharu’s unknown past was exposed.
~from Countless Time

Sixth in a six-volume series, all of them can read as a standalone.
The series goes like this:
1. Happy Yarou Wedding
2. Utsukushiki Kemonotachi {BEAUTIFUL BEAST}
3. Virgin Love
4. Toriko ni Natta Kemono {Crazy for You}
5. Junnai Tokkou Taichou [Junai no Seinen] {The Young Person's Pure Love}
6. Kemono wa Ai de, Iyasareru {Smooth over his hurt feeling}
7. Playboy Amour
8. Oboreru Kemono no Koibito
9. Men's Love