Anon comes back from his walk to find his pet Reimu with a stray Marisa, insisting that she wants to have little ones because they're easy. He initially refuses, but changes his mind, telling them to do what they want. Later, he compliments Reimu for going through all the trouble of having a child.
Taking the bait, Reimu demands to know more. He trolls her in various aspects: Both birth forms will drain Reimu's paste, Marisa being around means Reimu gets less food, mammal birth will be painful as the ko is coming out, while stalk birth will hurt when removing the stalk. She can loosen up her mamumamu with Marisa's penipeni, Anon says, prompting Reimu to check Marisa's size, but he says that the loosening part will hurt as well. He finally finishes off by congratulating her on going through all this trouble, and tells her not to die.
Misunderstanding Reimu's nervousness as a desire to do it, Marisa says that she'll bring Reimu to heaven with her penipeni... landmine words that make Reimu go berserk and beat Marisa up and chase her out, before asking Anon to take her back.
But Anon tells her he doesn't have a disobedient yukkuri like her, and that while he said that they could do what they like, he didn't say he was going to take them in. Pretending not to know her, he feigns surprise that she has a badge and takes it away, then kicks her and chases her out. Anon starts thinking of getting another yukkuri, hopefully one that's not so stupid.
One month later, there has been a lot of swelled up yukkuris with many stalks found dead around town...