"Y'know, I expected to feel different after becoming technically-an-adult."

"No dice?"

"It feels like yesterday plus one day."

"How curious that we aren't biologically predisposed to sudden maturation after a societally-determined number of astronomical events."

"Eh, it's more that I don't feel... er... socially different? Any freer? Maybe the fact that I'm planning on staying around or that I haven't graduated from the Wards is doing it."

"Well, you can register to vote."

"Yyyeah, I can, but I'm not sure that's the best use of my time."

"I'm not going to suggest you buy cigarettes."

"Not going to do that either, also not the best use of my time."

"What is the best use of your time?"

"Hmm."

"Is the answer 'birthday sex'."

"It's a possible answer."

"One of many, huh?"

"It's one I particularly like."

"But is it your favorite?"

"Of the options that have appeared so far in my mind, yes!"

"Hmmm, should we spend a while thinking up other possibilities just in case this one isn't the optimal one?"

"We could, or we could also do this one and if we come up with something better we can stop and go do that instead."

"But I hate being interrupted, Sadde."

"Then we can do it after we're done."

"All right then." And she puts her helmet on for the stroll to his room.

Eeeee! They stroll to his room—or rather, she might stroll, he's floating.

And birthday sex ensues!