Fics like A Marriage of Convenience

A marriage of convenience, that's all it was. The plan was simple, he would marry Richard and once the diamond had been handed over to them, they would divorce. Then Richard's family would leave him alone and let him be with whoever he wanted. But now that the time had come, Seigi could not bring himself to let things just end. "If... Only if you're okay with it, Richard, can we let this continue?" Read update on chapter 16

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3. I Would Give Everything by SocialDegenerate (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
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6. Sweet Birthday by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
7. Royal Milk Tea by seiginomikata (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
8. Tears by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
9. Moments in Their Life by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
10. Makes the Heart Grow by furiosity (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
11. ill at ease by valdera (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime), 宝石商リチャード氏の謎鑑定 - 辻村七子 | The Case Files of Jeweler Richard - Tsujimura Nanako)
12. Memories of Their First Kiss by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
13. A New Winter's Day by furiosity (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
14. Beautiful Things by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
15. Becoming Something New by Humblebeeother (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime), 宝石商リチャード氏の謎鑑定 - 辻村七子 | The Case Files of Jeweler Richard - Tsujimura Nanako)
16. A Study in Yearning by shonebrightly (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
17. Until we meet again by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
18. Ally of Justice by Ririban (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
19. and by that kiss, i'll vow an endless bliss. by Tsundeyama (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))
20. More Than Just a Light in the Sky by furiosity (宝石商リチャード氏の謎鑑定 | Housekishou Richard-shi no Nazo Kantei | The Case Files of Jeweler Richard (Anime))