An Owner's Responsibility and Duty
Anon brings his Reimu to get fixed, bribing and lying in order to get it to the clinic. It first gets its mamumamu sealed up, then when it thinks it still has its penipeni, they cut that off too. This depresses Reimu, because it wanted to make children with the neighboring Marisa.
Of course, Marisa has also been fixed too, and when they rub against each other for comfort, they discover the alternate method... before Anon pulls out the stalk and tells them that he doesn't want baby yukkuris. They try to slip it past him again and again, but always failing. At the end of the story, they find that it no longer works, and Anon says he'll bring them to the clinic because it's a disease, making the two yukkuris scream.
Most of the story is about Reimu's panicking response to the words of Anon and the vet.
Illustration: post #16103