Starlight Glimmer walked into the castle, meeting only silence. “Hello?!” She called out, her voice echoing. “Is anypony here?” From out of one of the room, Spike’s head appeared.
 
“Huh?” He smiled at her, walking over. He’d grown bigger over the years. He was almost a head taller than her now. Staring up at the dragon, Starlight noted his strange expression. “Starlight… You probably shouldn’t be here right now.”
 
“Huh? How come?” Noting her concerned look, Spike was quick to reassure her.
 
“Oh, don’t worry, its nothing bad it just Twilight is having one of her freakouts and I’d hate for you to dragged into~~” A shout interrupted whatever warning Spike was about to give her.
 
“Starlight!?” They both turned toward the sound, seeing a galloping mare rushing toward them. Before either could respond, Twilight grabbed Starlight and teleported them into another room. Starlight found herself in Twilight’s library, her head spiraling as she tried to get her thoughts straight. While teleportation was a usual thing for her and Twilight, to be suddenly taken from one place to another was way too much.
 
“Ugh…” She groaned, just as she regained coherence. “Twilight, why did you~~”
 
“What do you know about babies?!” She suddenly demanded, leaning int close to Starlight’s face.
 
“…What?” She said, frowning. Had she heard that right?
 
“Babies?!” She exclaimed, panic dancing in her eyes. “What do you know about them?!” Starlight rubbed her head, thinking about it.
 
“Uh, I know that they come from mommies and daddies having se~~”
 
“Traditionally, yes but not always!” Twilight interrupted as she began to pace the floor. “There are ways for same sex couples to have foals but it isn’t a usual thing and for the most part, it takes a lot of work since the sperm or eggs of the one who changes is a lot weaker than a natural born stallion or mare.”
 
“…Good to know?” Starlight replied, not really sure what she was supposed to be contributing to the conversation.
 
“I know!” Twilight cried, rubbing her eyes with frustration. “I wish I’d read about this before! Now I have to figure out how deal with this but you’re no help…” Starlight flinched at that. Granted, she hadn’t been but still. Kind of harsh.
 
“I’m sorry?” She said, backing away. “S-should I just go then?” She asked, already halfway to the door. Twilight didn’t respond. She was too busy muttering something into the book she was reading. Starlight nodded, figuring that was her cue to leave. “I’ll just go now then…”
 
Starlight Glimmer walked into the sitting room, frowning with confusion. What was that about? Laying on the floor, she finds Princess Celestia, reading a book while drinking some tea..
 
“Princess?” Celestia turned and smiled.
 
“Hello, Starlight.” She said, placing her tea back on the floor. “How are you?”
 
Starlight looked back at the door with a grimace as she walked closer. “A bit dizzy and confused but otherwise, I’m fine.” She sighed.
 
“Oh? Did you bump into Twilight?” She asked. Starlight nodded.
 
“Yeah, apparently, she’s having one of her ‘freakouts’ or something.” She frowned at this. For as long as she’d lived with Twilight, she’d never seen the mare freakout like this. Apparently, though, this was a usual thing for her.
 
“Yes, that sounds like her.” Celestia laughed, turning back to her book to turn the page with her magic. The book had a bunch of pictures of foaling mares and foals.
 
“…Is there something I’m missing?” She asked, her confusion growing every second. “Why is Twilight acting so weird?” Celestia shrugged.
 
“Oh, that’s probably my fault.” She replied, barely looking up as she turned another page. “I told her this morning that I was pregnant and she’s been scrambling about since then.” She chuckled at that, not noticing Starlight’s jaw dropping
 
“… What?”
 
“Oh, did I forget to mention? I’m pregnant with Twilight’s child.” She said with such ease, Starlight had to shake her head clear.
 
“…WHAT!? B-but how?!” She stammered, her mind trying to figure out how this worked. “You’re both mares and…”
 
“Sex change spell.” She replied, smiling down at her tea. Sex change Spell? That made sense. Celestia could afford such a spell but…
 
“Why?” Starlight asked, so confused. She didn’t get why they’d do such a thing. Celestia was apparently into mares so why turn Twilight into a stallion? Considering Twilight’s reactions, this was probably an accidental pregnancy.
 
“Twilight is very sexy when she becomes a stallion. She gets all dominant and possessive… It’s very appealing.” She explained, her eyes getting misty with desire. The alicorn shivered with pleasure as she continued, letting out a slight moan. “Sometimes, she’d overpower me and push me to the ground just before~~”
 
“I really don’t need to know that!” Starlight interrupted, covering her ears. “Faust save me, I don’t want to know about your sex lives…” Starlight groaned, closing her eyes as unwanted visions of the two mares (one a stallion now) doing things… She shuddered is discomfort. It was so weird to know that one’s monach liked being dominated by their sex-changed wife… Ugh.
 
“Really? I didn’t think you’d be so opposed.” Celestia said, frowning. Starlight wasn’t opposed. She just didn’t want to know about her monach’s sex life. “Twilight told me about what you and your husband do.”
 
“… She what?” Starlight faced burned. There was no way Twilight knew.
 
“She said that she suspected your husband likes to be ‘pegged’ or something.” She pointed, frowning as she lifted another book. This one was a very adult magazine. She flipped through it until she found the page she wanted “Pegging: anal sex reversed. instead of the stallion sticking his penis up the mares butt, the mare wears a strap-on and sticks it up the sta-”.
 
“I’m going to kill her!” Starlight screamed, her face burning hot with embarrassment.
 
 

 
So after a couple harsh scenarios, I’ve decided to draw something more humorous and lighthearted. This takes place about a year or so before Sirius is born. Twilight is freaking out as only she can and Starlight is very confused. Celestia is chill as f*** cause that’s just how she rolls. That and she’s used to Twilight’s freakouts. She thinks it’s cute.