Chibiusa and Hotaru, as soon as they turned 16, started dating. They go to the park, the aquarium, the forest, the beach and they have a good time together. Usagi and the other girls know about it, of course, and they're happy for Chibiusa and Hotaru. When the teenagers aren't holding hands, they kiss, but always discreetly and out of sight.
"I can't wait for our 18th birthday." Hotaru said to Chibiusa one day.
"Why?"
"You know why."
Hotaru winks at Chibiusa and she blushes.
"Oh, Hotaru."
Chibiusa hugs her.
"I can't wait either. Hey, how about we go get some ice cream?"
"That's a good idea."
While holding hands, the Rabbit and the Firefly set off.