***
Luna placed a pillow over her ears, grumbling. The sounds of groaning and the smack of wet lips against one another echoed from the room above. "We will have words with Dearest Tia about the relocation of our study to the Lunar Pavilion."
She sighed as she heard a particularly loud "mmph! Yes, there!" Luna attempted to flip through the book on low-light plants she was reading. Every stalk seemed to bend in a tempting way, each set of acorns nestled together reminding her of her sister and her student in a sensuous embrace. She shuddered and tried to press on. "Mnnnnaaaaaaaaah--"
"Faust alive! Is there no shame in Canterlot Palace?!" Luna's bellow echoed throughout the room.
"Shh."
Luna blinked. She peaked out from under her pile of sound-suppressing pillows to find a pair of alicorns reading a rather large book in the corner of the room.
"Hiding from paparazzi" Twilight said as the audio-spell reached the end of its loop. "MnnnnaMnnnaaaMnnnaaaaMnnnnaaa" She gave it a short, sharp zap, and returned to leaning on the crux of Celestia's neck with a dopey grin.
"Do you think we should tell her that as part of the test process we set her alarm to make that noise?" Celestia inquired.
Luna was quite proud that there was enough force behind her pillow's launch that it was able to knock Celestia face first into the book.