Title: Jon's Cat. Sentence 1: Jon had always wanted a cat ever since he was a little kid. Sentence 2: His mom would never allow him to have a cat because she had allergies. Sentence 3: When Jon finally moved into his own house, he bought a cat. Sentence 4: When he brought it home everything was fine, for a few days.
Jon soon realized that he had cat allergies and gave the cat away.