Ves derived pleasure from Lucky's pain.
The more Lucky suffered from his stomach ache, the greater the probability of producing fantastic gems.
In order to ensure that the gem cat sufficiently digested the massive amount of metals that he had undoubtedly devoured during his trip to the surface, Ves did not want to end Lucky's suffering too soon!
"Hehehe. Just leave him be. He'll get over it eventually. It is normal for cats like him to suffer from stomach aches. It's just like having a toothache. He'll probably get over his problem in a few days."
"What if he is still hurt after that?"
"Then I'll feed him with a special laxative that will force him to go to the toilet early. Don't worry. Your father has everything under control."
Once Ves dealt with this farce by convincing his children to ignore Lucky's awful condition, he was finally able to take his wife aside so that he could introduce his latest experimental project to her skeptical ears.