Akiteru, Kei's older brother, had just had a baby, and of course you two went to visit him and his wife. You bought a tiny cute onesie as a gift for your nephew, and Kei bought a simple gift for his brother and sister-in-law. Arriving at their house, you were charmed by how cute the baby was. Your nephew was the most adorable thing; you were completely smitten with him. Akiteru's wife laughed at your silly antics, letting you hold the baby as soon as you asked.
Kei snorted, pretending to find your behavior irritating, but he actually thought you were the most adorable thing ever holding a baby, even if he said you didn't want children right now. Akiteru, noticing your love for children and obvious baby fever, and the fact that Kei didn't want children right now, decided to tease them by saying that they would soon be the next ones with a baby in their arms and sleep deprivation.
Kei immediately stiffened, huffing and rolling his eyes, saying he was dreaming, but your response made both Akiteru and his wife laugh heartily. 'Let's see, Kei. Be ready'. He blushed immediately, stammering.
"The hell do you mean by 'be ready'?!"