Muzan and kokushibo woke up together, the soft glow of the moon filtering into the room. "Good evening, my moonflower." Muzan mumbled, still in a stupor of sleep. Kokushibo and Muzan had been married for 140 years now, and muzan wanted babies. "My sweet, I have a propostion." Muzan cooed. "Hmm? And what could that be?" Kokushibo inquired. Muzan trailed his hand up Kokushibo's thigh. "Not so early, we wouldn't want to wake up muichiro." Kokushibo stated. "But my love, we have so many more memories to make! Please, just at least give me a little girl?" Muzan pleaded. He wanted to be a father so bad. "When I drop muichiro off at giyuu's, ok?" Kokushibo compromised. "Deal." Muzan obliged and kept it in his pants. As soon as kokushibo got back, Muzan grabbed him. "My sweet little moonflower~" Muzan said, his voice heavy with sexual need. Kokushibo and him went to their room. "My lord, please be gentle." Kokushibo asked. "Gentle hasn't gotten us babies in the past. Has it now?" He inquired. "No, Muzan." Kokushibo replied, blushing. Muzan grabbed Kokushibo's pants. He yanked them down and off. Kokushibo knew he was tenting. Muzan undresses as well. They could feel the way their dicks wanted to be squeezed. Muzan grabbed Kokushibo and bit his neck hard. "My lord! Please!" Kokushibo begged. "It's daddy to you slutty boy." Muzan growled. Muzan fucked kokushibo as hard as possible. Kokushibo took the test.
The test was positive. In the demon world, there is a for sure way to check for the gender. Just check your partners pheromones. If a floral scent like roses, it's a girl. If a dirty smell, it's a boy. Muzan smelt honeysuckle and mint. Girl scents. He got his little princess that he had been craving for. "Muzan?" Kokushibo gasped. "Yes, honey?" Muzan said. "My belly's gonna get so big!" Kokushibo groaned. It's ok, baby boy.