Well, this is a bonus chapter that I wanted to add for you all. Hope it really delivers that final bit of satisfaction that many people like!
A decade has passed since Abstraction and Pan Fry were indoctrinated into Equestria. Within that time, Pan Fry and Medium Rare had both gotten married, and they all started spending a lot of time with each other. Abstraction and Lyra really enjoyed Medium's company, as well as the dishes he and Pan would cook up whenever they visited... especially after what Abstraction and Lyra had gone through back in the human world. Things could not be going any better for the two... but, there was something that had been able to offset such a claim...
Pan Fry and Medium Rare had decided to visit Pan's daughter-in-law, given that she had not done so for a while. She arrived at Lyra's house in Ponyville one afternoon, just when she happened to know that her son would be there with her. After knocking on the door, she opened it to see the mint-green mare.
"Oh, hello Pan!" Lyra said.
"Hi, Lyra." Pan Fry said with a smile.
Medium Rare spoke next. "How have you been doing?"
"Oh, just fine." Lyra responded.
She invited her parents-in-law into the house... and that's when Pan Fry happened to notice a bit of distension in Lyra's lower abdomen.
"Oh, Lyra..." Pan spoke. "...what's up with your belly? Have you been binging on cake like Celestia or something?"
Both she and Medium chuckled. Lyra weakly smiled as she nervously crossed her forelegs.
"Well..." Lyra began. "...see... Abstraction and I... we've been... meaning to tell you..."
The Unicorn mare trailed off. Just by the tone of her voice... Pan Fry and Medium Rare could tell that something was up.
"You mean..." Medium said. "...it... had nothing to do with eating?"
Lyra shook her head.
"So... y-you're...!" Pan Fry said with her eyes wide.
Lyra nodded, and gently rubbed to bulge in her stomach.
"...Abby's... gonna be a daddy." Lyra said.
It was blatantly obvious now...
...Lyra was pregnant.
At that moment, Abstraction happened to walk into the room to see his mother and new stepfather.
"Hi, Mom! Hey, Medium!" he said.
The two did not respond, and simply stared in surprise at the Unicorn stallion.
"What?" Abstraction asked.
"...You and Lyra... are gonna have a baby?" Pan Fry asked.
Abstraction was put on the spot by the question. He turned to his wife.
"You told them?" he asked.
Lyra nodded. "Yeah. It's definitely in their right to know that I'm two months in."
Pan and Medium both still said nothing. It took them by surprise, since neither of them had been expecting it after so long. Still, they were quite happy that this was happening.
"Yes, mom..." Abstraction said. "...me and Lyra have finally decided to have a child."
"To think... I'm gonna be a grandmother..." Pan Fry said, her eyes at the floor as she smiled weakly. "...I feel so old."
"Well, I sure look forward to having a new member of the family!" Medium Rare added.
(XXXX)
Seven months later, Abstraction was sitting in the Ponyville Hospital waiting room with Pan Fry and Medium Rare, anxiously wrapping his forelegs around himself, and tapping the floor with his hind legs as he sat in the chair. It made him worried that something could end up going wrong, or if it didn't, simply knowing what sort of pain Lyra was in throughout her childbirth.
After a couple of uneasy hours, the door to the hallway opened, and a doctor pony with a clipboard stepped into the waiting room.
"Abstraction...?" he said, looking at the clipboard.
With that, the stallion in question quickly stood up and rushed straight over to the doctor.
"How is she!?" Abstraction asked him. "How did it go!?"
"Take it easy, Mr. Abstraction." he said, looking at the clipboard. "All went well with no complications; your wife has given birth to a healthy baby filly."
Abstraction felt his heart melt in that moment.
"...C-can I see her...?" he asked.
The doctor nodded, motion with his hoof the way to the recovery room.
"Right this way..." he said.
The doctor escorted Abstraction to the recovery room that Lyra was taken to post-childbirth. Once they arrived, the first thing Abstraction saw was a very tired, but happy-looking Lyra was laying in the bed, cradling a bundle to her chest. He gasped the moment he saw it. Lyra looked up at him, a warm smile filling her face.
"...A-Abby..." she managed to utter, right before she turned the bundle around to face her husband.
Abstraction could feel his eyes welling with tears as the corners of his mouth rose up on his face, just looking at his new child. The newborn filly was a Unicorn with a mint-green hide like her mother's, but her mane and tail were both the same color as her father's hide. She even had Abstraction's eye color.
"...So..." Lyra said, sleepily. "...what... should we name her...?"
After pondering for a moment... Abstraction thought of a perfect name.
"How about... Art Strings?" he suggested.
Lyra smiled. "...That's... an excellent name...!"
"Well, if I may..." the doctor spoke. "...congratulations, you two. I hope you take good care of your new daughter."
Pan Fry and Medium Rare came into the recovery room a little while later, and all of them were just as surprised and happy as Abstraction was. They were all very happy to have Art Strings as part of their new family. Once Lyra had recovered a few hours later, they left the hospital and went straight back to Lyra's house.
It was finally decided that Lyra wanted move to Canterlot with Abstraction, so as to raise their child together. Neither of them had ever thought that they could ever be blessed with an offspring... but the multiverse has finally granted them the relief from their hardships that they had desired for a long time. For one of them, though... this was the absolute pinnacle of the impossible that he thought would never occur for a loser like him... but his thoughts had changed entirely after ten long years.
Having his own daughter was the greatest thing Abstraction could have ever asked for. There was absolutely nothing that could've made the stallion any happier in his entire life.
(XXXX)
One late night, after Art Strings, now a few months old, had fallen asleep while watching a movie with her parents, they took her to their bedroom and laid her in the crib... but instead of leaving her alone like they usually did, they stopped and stared at her for a little bit while she slept.
"She's absolutely beautiful, isn't she?" Lyra asked.
"Yeah..." Abstraction said.
He leaned over the crib briefly, looking at Art Strings as she took slow, calm breaths... her eyes closed...
"...and I know she'll grow up to be a fine mare." Abstraction said.
Lyra placed her hoof on his shoulder, turning him towards her.
"And it's because of you that we finally get to live such a happy life." Lyra said. "I can't ever thank you enough for all that you've done for me, Abby."
Abstraction blushed. "...If there's anypony I should thank, Ly... it's you. You helped to turn my life around... and it ultimately led to us finally getting to have our own daughter."
With that, the two hugged and kissed each other very passionately for a little while, until they decided to separate so as not to wake Art up.
"In fact, we should be in bed ourselves." Lyra said.
"Yeah, you're right." Abstraction said.
The stallion and mare both climbed into their bed, tucking themselves in and facing each other as they readied themselves for a good night's sleep.
"Goodnight, my love." Lyra said.
"Goodnight, my angel." Abstraction said.
The two shared one final kiss, before they turned out the lights, and shortly afterwards, fell asleep.
Yeah, just thought I'd throw in a final piece to the story, showing the events that happened after the story... in fact, after the TV show (according to my personal headcanon). So, I hope this satisfied a lot of you! I may come back to this saga someday... but for now, I'll be focusing on other stories. So, once again, thank you all so much for your continued support, and I'll be back real soon! Keep holding on...