Whatever illustration was on Tumblr, it's long gone now. This is the text that was on there when you could find it: “Children should go to sleep early,” said Nico with a smile on her face as she put aside the phone.
“I don’t like it when you call me that Nico-chan.”
“Eh?”
“Because… when you say that it sounds like the gap between us becomes bigger, that you’ll become an adult and leave a kid like me behind…”
Nico blinked a few times, watching the sleepy, blushing Umi pout. The smile returned to her face and she gave her lover a quick kiss.
“Silly Umi. No matter how wide the gap and how long the wait, I’ll always wait for you.”
END
Why NicoUmi? I don’t know. But here, have a NicoUmi anyway.