A sharp scream shattered the morning birdsong symphony around Golden Oaks Library. Twilight leapt from her bed, sprinted down the stairs, and slid to a halt at the bottom. Anything that could make her wife scream like that had to be a serious threat. She pricked up her ears, pinpointing the sound.
Twilight burst through the bathroom door. Her horn pulsed with power; her blue, grey, and violet mane frazzled by pillows and pegasus drool. She would have struck fear into the heart of even a battle-hardened royal guard, but the sole occupant of the bathroom merely turned and pointed a hoof at her rainbow-striped forelock.
"Have you seen my mane lately Twily? Why didn't you tell me about this? How long has it been there?"
Letting the magic drain from her horn, Twilight took a moment to clear the morning gunk from her eyes. She summoned her glasses--which appeared on her nose with a quiet popping sound--and examined her lover's mane more closely.
"I'm not sure what you're talking about Dash. I don't see anything wrong."
"Besides the giant patch of grey you mean? The beginning of the end of my coolness?"
On closer inspection there were a trio of silver hairs near the edge of her orange streak. Twilight wrapped a leg around her wife and pulled her in for a hug.
"Oh Dash, I've had grey hairs for years now and nopony has even noticed. It's nothing to worry about."
"You've got that sexy librarian thing going on. You make it look good." Dash's leer faded back into a frown. "But 'Rainbow' is my name. Pretty soon I'm gonna have to change it to Dull Dash. I'm not as fast as I used to be either. 'Grey Slowpoke' has a nice ring to it, don't you think?"
"I can conceal them with an illusion spell if you like, but I think they make you look dignified. You of all ponies could stand to have a little more dignity you know."
Rainbow looked up hopefully. "You really think I'd look good with grey hair, Twi?"
"You always look good, weren't you just telling me that yesterday?" Twilight gave Dash an even more smoldering leer than she'd received. "I'm getting old enough now that I'd rather be with a distinguished flight school professor anyway, not some show-pony."
At this Dash looked back into the mirror. She puffed out her chest and made what she presumably thought was a serious face. Twilight concentrated for a moment and temporarily turned Rainbow's entire mane to varying stripes of greys and silvers. Both mares admired her sleek--and undeniably more distinguished--features. She did look good.
"And if you're serious about the name change, might I suggest 'Quicksilver'?"