Ark Academy, chosen as a model case for a school that integrates different races. After the elves Iris and Aegis transferred in, the dragon leader, Ursula, arrived. Ursula, a member of a powerful dragon race, was a troublemaker who looked down on other races at every opportunity. As a teacher, he scolded Ursula, but she summoned him with an ominous request. "You've passed. From now on, I'll grant you the honor of procreating with me." Ursula's goal was his strong virility, which had allowed him to perform '____' with two elves. She planned to receive his seed and leave behind even more powerful offspring. Ursula's mating was rough and forceful. She treated him like a tool, forcibly extracting his semen. Unable to bear it any longer, the teacher gave her a strong look, but then something strange began to happen to his body... A dragon-type ____ character joins the ____ mating with royal sisters!? With the number of mating cycles inevitably doubling, will your sperm production keep up?