Finally, it was almost heat week. Twilight had been excited for this for many reasons, mostly it being the possibility of pregnancy. She had invited her friends and the princesses over for the fusion, and Spike had sent letters to Sunburst and Thorax. They were going to fuse a week before heat started so they knew that the new and improved spell worked. Someone knocked at her door, and Twilight almost tripped running to open it. It was Spike.

"Hey, everyone is ready and downstairs," he said. "Are you ready?" Twilight nodded.

"Thank you," she said. "You better be ready." Spike snickered and led Twilight to the Cutie Map. The princesses were there, her friends were there, including Sunset Shimmer and Starlight, Thorax and Sunburst were there, and for some reason Trixie was there. Twilight decided to address that first.

"Why are you here?" she asked Trixie.

"Because the Great and Powerful Trixie desires to be part of this experiment!" Trixie exclaimed. Twilight stared at Starlight.

"What did you tell her?" Twilight asked.

"Hey, she asked what I had planned for heat week and I told her about this," Starlight said. "I didn't know she would want to join us! Not that it'll be a bad thing, though. Let her join us."

"Ok, fine," Twilight said. She walked over to her chair and stepped up onto it. "Ok, everyone! We need to talk before the fusing starts!" Everyone stopped talking and stared at her. "Ok, before we fuse, are all of you ok with doing this? We will be having sex later on, and we are aiming for pregnancy!" Everyone said yes. "Ok, now that we got that out of the way, are we sure about the set of genetics that the baby would be receiving? Do we want to add or subtract anypony?"

"Is Trixie in this?" Starlight asked.

"Yes, Trixie is in this!" Twilight said. "Do we want to add anyone? Like any more males? There's only three."

"How about Big Mac?" Spike asked.

"NO!" Applejack yelled. "Do not add Big Mac!"

"Haha, don't worry, I'm kidding," Spike said. "That would be weird."

"Good," Applejack growled. "It would be weird."

"Are you sure?" Celestia asked. "I wouldn't mind at all if Big Mac joins us."

"Me neither, actually," Luna said.

"We're not adding Big Mac," Applejack said.

"Why not?" Luna playfully said. "We're fusing together so many mares, it probably wouldn't count as incest. Would it, Twilight?" Twilight shook her head.

"It wouldn't, but seriously, is there anyone else we would like to add?" Twilight asked.

"I think their fine," Luna purred. "Why is it that we're fusing a week early, again?"

"We need to make sure that the new spell works, especially on the scale that we're doing it on," Twilight said. "I don't know what would happen if we defused while pregnant, but it would probably be bad." Luna nodded.

"Ok then," she said. "Now, who's going to be fused first?"

"They are," Twilight said, nodding at Spike, Thorax and Sunburst. "So, go into the next room, and get undressed. I'll be there in a minute or two to fuse you together." The boys nodded and exited through the door that Twilight had indicated.

"Now, while they get ready, are there any other questions?" Twilight asked. Celestia raised her hand.

"Is Cadence really going to be the only one running Equestria?" she asked.

"Shining Armor is going to help her, but we might go do it from time to time. Although we probably shouldn't let the public know that this is why the princesses have disappeared," Twilight said. "That might cause problems. Especially scene so many princesses are involved in this." Trixie raised her hand.

"How long is the fused boys dick going to be?" she asked. Twilight blushed.

"I don't know," she said. "But I was told that Shining Sensor's penis was 11 inches erect, but that was Thorax and Sunburst's fused form. Adding Spike to the mix could shorten the length." Suddenly there was knocking on the door of the kitchen, where the boys had gone.

"Twilight, we're ready," Spike said. Twilight grinned.

"Good," she said. She quickly opened the door, entered the room, and closed it again. She turned around to see the boys all in the center of the room, and she started charging the spell.

"This won't hurt, will it?" Spike suddenly asked.

"No," Thorax and Sunburst responded simultaneously. Then Twilight casted the spell, bringing them together in a bright flash of light. When her eyes cleared and she could see again, she saw the newly fused form laying on the ground in front of her. He was a surprisingly deep purple color, almost black. He had shiny black scale like fur, same colored horn, orange antlers, Orange hair, and purple spins jutting out of his back like with Spike. Twilight grinned.

Aww, yeah, she thought. This is going to be nice. Twilight exited almost as quickly as she entered, and grinned.

"It has been done," she said. Twilight started taking her shirt off. "Now, everyone, get undressed." A few minutes later, all the clothes were lying in a pile in a corner.

"Is everyone ready?" Twilight asked. As everypony said yes, Twilight started charging the spell, mentally preparing herself for what might happen after they all fused. Then she casted it, bringing everypony in, and blacked out as they all met. Meanwhile, in the kitchen, the fused form of Spike, Thorax and Sunburst woke up. He rose from the ground and looked at his skin, and other wise checking himself out.

I have abs, he thought. Nice. His stomach gurgled, and let out a massive burp, green fire spewing from his mouth at a length that Spike had never done before. He grinned.

Nice, he thought. Hmm, what am I going to call myself? He sat and pondered that for a minute before deciding on a name.

I'll go with Magic Flame, he thought. I wonder if the girls have fused together yet? He opened the kitchen door and saw a large chested, large rear ended light teal girl lying on the ground, face up. She had flowing multihued yellowish hair.

They've fused, Spike thought with a grin. The girl started to stir, and opened her eyes.

Author's Note

Well, here it is! I hope you all like it!