The Beastkin Captain's (Provisional) Engagement

Juujin Taichou no (Kari) Kon'yaku Jijou
獣人隊長の(仮)婚約事情

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Juujin Taichou no (Kari) Konyaku Jijou Totsuzen desu ga, Ookami Taichou no Kari Fiancée ni Narimashita
獣人隊長の(仮)婚約事情 突然ですが、狼隊長の仮婚約者になりました
novel

A member of the beastkin nobility and the heir to the Bearwolf Marquis, Leold, suddenly bites Katie on the shoulder, branding her with a "Mark of Proposal". Katie, who was crossdressed at the time, is mistaken as a male and dragged into being his fiancée for a few years until the mark disappears... But the two have the worst relationship...! What is this? A form of courtship?! Source: MU

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The Beast Knight's Courtship
Juujin Kishi no Kyuuai Jijou· 獣人騎士の求愛事情
manga

Emma, ​​a human, has a close friend in the beastman aristocracy, the Serpent Duke. She works as a potion maker, but the Serpent Duke has an unexpected request. It's a request for a strategy to help Lyle, a sacred unicorn beastman and royal guard knight, overcome his fear of women...!? They begin their training, but they start by holding hands and even interact like lovers! ...Don't you think their physical contact is a little too intense? A courtship love fantasy begins with a lesson with the unicorn beastman knight! (Source: Ichijinsha, translated)

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The Black Rabbit Count's Devoted Marriage Proposal
Kurousagi Hakushaku no Dekiai Kyuukon· 黒兎伯爵の溺愛求婚
manga

*"From now on, you are my temporary fiancée."* Emilia, the daughter of a poor viscount's family, is shy when it comes to romance and works hard at her side job of embroidery. Suddenly, a blind date comes her way. Her prospective groom is a beastman nobleman, a count. And a black rabbit at that?! She thought he'd be the cute type from the sound of it, but it turns out he's actually a beastman gentleman who's a top-class martial artist and herbivorous animal... Overwhelmed by his momentum, Emilia is marked with a "marriage proposal mark" and becomes his temporary fiancée...?! (Source: Ichijinsha, translated)