(Have Twilight pad and pacifier up while working on her experiments. Rainbow smells foal powder, and goes to investigate.)

"Yeah, she did, and she's an awesome lil sis/daughter. I'm sure she'll be with me in the Reserve Wonderbolts in no time." Rainbow grinned, as she began reading. "You can go back to your mad science ce stuff." She chuckled.

"Alright, if that's what you want." Twilight conjured a new alchemy set and began making a new potion, the sent of foal powder lingering in the air.

Rainbow sniffed the air, detecting a familiar scent her own lower regions had carried almost every day of her life. She set her book down gently, and tried to find the source. It was coming from Twilight's basement laboratory. Rainbow rubbed her chin, "Hmm." She silently made her way towards the door, and cracked it open a peak. What she saw made her jaw drop.

Twilight glanced over and paled when she saw where Rainbow was. "Rainbow!" She ran over to the blue mare and stoped when she saw that Rainbow had already seen her nursery. "R-Rainbow?"

"Y-you...." Rainbow looked around e nursery, "Twilight, you're an Adult Foal too?!" Rainbow grinned, her wings buzzing, "This is awesome!" She hoof pumped, "Nice nursery." She complimented.

"I...y-you..." Twilight shook herself in an attempt not to faint. "Y-Yeah I'm an adult foal. I had no idea you'd be one too."

"Yeah, neither did Shy-Shy." Rainbow blushed, "Hold on, let me get diapees up." Rainbow zipped back to her bags, padded up, and rejoined Twilight. "So, does Spike, your brother, or any of the other Princesses know? , she inquired.

Twilight blushed at seeing how eager Rainbow was to be padded, quickly diapering herself. "Nopony else knows except for us." She fidgeted slightly. "So, y-you wanna make this a..a playdate perhaps?"

"Sure, why not?" Rainbow shrugged, fluttering over to the playpen. She pulled out her bag, pulling out a well worn, repaired Pegasus plushie.,"This is Miss Snugglewings." She giggled. "And, on my end, a few ponies know. Fluttershy, Rarity, and Scoots. Fluttershy's my...mommy." She flushed, "Scootaloo took some time to accept it, but she plays with me sometimes, and Rarity makes me clothes and fixes up Miss Snugglewings." She hugged the plush, "So, how's you get into the AF lifestyle?"

"Cadance suggested being an Adult Foal after she heard about the uh...Want It Need It Incedent." Twilight shuddered. "I grew to like it and eventually started acting like a foal down here every day. What about you?"