Operation: Kittens!
One day, Duo bounced up to Heero. "Hee-chan, can I have a kitten? Pleeeeease?"
Heero frowned. "Why are you asking me? Go ask Quatre."
"'Kay!" Duo bounced off again. A minute later, he bounced back in. "He said yes!"
Wufei rolled his eyes. "Heaven save us..."
The next day, Duo got his kitten. It was black and white and regarded the others disdainfully, until Duo picked it up and hugged it. It started purring like a chainsaw, but glared murderously at anyone within 5 miles of Duo. Duo was tempted to dub it "Hee-chan", but finally decided on "Sarutobi", or "Tobi" for short.
Once they got home, the kitten proceeded to tear up all of the carpets and shed on the furniture. He then plopped himself down on Duo's bed to nap. Duo grinned, and followed suit, leaving the others to clean up the mess, get a litterbox, and debate over who was allowed to kill it first.