Kouhai Kyuuka: Juujin Otto no Honki no Hatsujou ga Tomaranai

In a world where humans and beastmen live side by side, Hinako finds herself trapped in an emotionally distant arranged marriage with Soshiro, a wolf beastman. Troubled by the growing gap between them, she resolves to take matters into her own hands and bridge the divide. Gathering her courage, she surprises him by formally applying for a "Mating Leave," a special period of absence timed specifically to coincide with a beastman's natural heat cycle. She confesses her deep desire to share a truly passionate night together, hoping it will finally bring them closer. Her bold confession awakens something primal within Soshiro. Revealing the sharp fangs he had always kept carefully hidden, he warns her that his restraint has reached its limit and urges her to prepare herself. His longing for her proves far more fierce and consuming than she ever could have anticipated. As his first heat takes hold, the emotional walls between them finally crumble. On this transformative night, Hinako is enveloped in an overwhelming tide of devotion, discovering the profound depth of her husband's love as their bond is forever changed.