This scene is from:
First Truths
By:
Lilac Summers
You can find it at:
HERE!!!

"Hi! I'm not sure we've ever been truly introduced.
I'm Aino Minako. Usagi's friend? The one wearing the
silk teddy?"

Mamoru flushed at the reminder while Usagi stifled
guffaws from her place on the floor. He decided
to turn the tables. "Ah, yes. I know. I'm supposed
to be madly in love with you; at least, that's what
Odango told me after she climbed onto my lap."