Refuel, recharge, reorient.

After fucking his way through four (technically five) hypersexual ponies, Isaac was feeling well and truly exhausted. Even his enhanced stamina, health, and manhood was flagging after such a quick back-to-back onslaught.

If only this orgy had taken place in a restaurant with fresh bread and pastries.

A few minutes later, back down on the first floor of Sugarcube Corner, Isaac practically inhaled a fresh jelly-filled croissant, then washed it down his throat by suckling on Mrs. Cake's swollen breast and gulping down her warm ponymilk. Then he sucked on Pinkie Pie's nipple for good measure, since he'd gotten them to sit together as they pampered him.

Mrs. Cake rubbed the top of his head lovingly. Even sitting down she was still taller than him standing. "Awww, you're so cute getting your energy back! By all means, drink up as much as you like. It'll be a few minutes before we open the store again."

"Yeah!" Pinkie agreed before pulling Isaac into a face-boob-mashing hug. "You made us all cum so many times, all at once! That was super great! Not that sexytimes have to be purely transactional or anything, because that opens up all kinds of flawed emotional dynamics, but if it was transactional, you definitely earned your keep and then some!"

That gave Isaac a spur-of-the-moment idea that he didn't mind trying out on the spot. He pulled back from sucking Pinkie's nipple and, after a moment to catch his breath, said, "Do people in this world sometimes pay for things or trade favors with sex?"

"Some cultures more than others," Mrs. Cake answered. "We ponies like sex being free and good-spirited and don't like making people feel **** to fuck if they need food or shelter, for instance. But the option's always on the table, even if it isn't used much. Zecora, though, she comes from the nomadic zebra lands, where it's very common to 'barter,' so you might see her giving out deep lickings or strap-on peggings at the market to pay for her potion ingredients."

"By comparison, the griffons really don't like that whole thing!" Pinkie Pie chimed in, a finger on her chin in thought. "You head over to the griffon lands, you better have a sack of bits and hold onto it tight! But if you visit the yaks? Be prepared to prove that you can fuck hard, rough, and often!" She shuddered in her seat from some intense memory, her hips wiggling and booty jiggling.

"Huh, interesting..." Isaac murmured. "So with me being the Master and fucking you all..." He trailed off so the thought didn't become a question.

Mrs. Cake gave him another comforting tussle of his hair. "You don't need to 'barter' for anything with us, dearie. We're here to support you on your quest to become Harem Master. You don't owe us anything, and we owe you the world, just from that."

"It's super-nice of you to check, though!" Pinkie Pie remarked with a giggle. "I really hope you get to be the one! My Pinkie Sense said so, but still! You're already waaaaaaaaay better than when Sombra and Tirek tried!"

Mrs. Cake blushed and put a hand on her cheek. "Oh gosh, don't remind me..."

That got Isaac's attention. "What happened with them? I remember reading about them being villains or something..."

Pinkie Pie nodded, making her soft breasts jiggle. "Yyyep! I was there to face both of them! Though it was Spike who really helped take down Sombra. He was the one who noticed the telltale signs of Sombra being kind of a closet buttslut, so he was able to track down the missing piece of the Crystal Heart because it had been reshaped into a dildo! And then he bravely distracted Sombra with a big fake crystal dildo while Cadance restored the real Heart! Our dragon friend has got statues in the Empire to this day, haha!"

It took all of Isaac's control over his facial muscles not to crack up at that casual description. Even then, a quiet half-snort barely escaped through his nostrils.

Mrs. Cake pouted and shook her head. "I still remember when Tirek went on that magic-draining rampage. Wasn't good for anypony. And to think, he did all that because he wanted to use all that magic to... what was it, create a new Master from scratch, or summon one from another world?"

"I think it was both!" Pinkie Pie replied. "He tried the second one a thousand years ago and it didn't work, so he was about to try the first one! He was gonna create some kinda magical construct that would act like the super-cruel, world-ruling Master he craved and pour everyone's magic into it so he could serve it! Then we showed up in our rainbow forms and stopped that and returned all the magic he stole, thank goodness!"

"Serving a construct..." Mrs. Cake echoed with a shudder. "No matter how big its cock was, that wouldn't have been right." She rubbed Isaac's back and smiled. "Thank goodness you've finally come along, Isaac."

That story was a bit less silly, though still weirdly perverted from what Isaac knew. These evil, cruel, charismatic villains, all still obsessed with serving a Harem Master and having that desire twisted in their own ways... Something about the intensity of those desires and how perverted their minds had become sparked a desire in Isaac's loins. "Those villains are still being held in captivity, right?"

Pinkie nodded vigorously. "I think so! We put Tirek back in Tartarus, and Gleaming and Cadance found Sombra while he was super-weak and imprisoned him beneath their crystal castle!" She blinked in realization. "Wait, are you gonna try and recruit them into the harem, too? After everything those super-dangerous guys did?"

With a sheepish shrug and a grin, Isaac said, "I fully believe that everyone deserves a chance to please me. Besides, taming them would make a great proof of my dominance as Master."

As he was saying that, Mr. Cake passed by with a fresh tray of pastries. He shuddered in pure lust as he overheard the last bit of the conversation. "Isaac..." the baker murmured, "the way you dominated me and my family... Sombra and Tirek don't stand a chance. I believe that for a fact."

What an oddly sincere compliment, given everything. Isaac took one of the pastries and raised it up to him in acknowledgement. Besides, Mr. Cake was more right than he knew. "I'll get around to them later. For now, I've still got my mission to fuck the rest of the Elements."

"Ooh! Ooh!" Pinkie Pie raised her hand like she was in class. "I've got a suggestion for who you should do next!"

"I'm all ears, Pinkie," Isaac said, grinning at the fact that she was so eager to help him fuck her friends.

"You should do Rarity next! That would totally cheer her up! She doesn't get a lot of business for her dresses, with so many ponies going naked or half-clothed and all, and having you sweep her off her hooves would really brighten up her day!"

Isaac's grin fell. "Oh. Right." There was bound to be a difficult ripple effect eventually...