Time to- Oh, she actually passed out. Whoops.

Isaac smirked and stepped forward. "Wellllll... I think you can guess I'm not exactly here for clothes...!"

Rarity swallowed hard, placing a hand above her breasts as if to try and keep her heart steady. "I-I guess so...! You- You look lovely, by the way - is that the royal tailor's work? Even on a quick job, her talent shows..." Her horn lit up and she levitated a small hand fan to wave in front of her face as it heated up.

Spike took a couple sniffs of the air, and his eyes widened. "Dude, did you... Did you fuck ALL the Cakes and Pinkie Pie?!"

"Got it in one!" Isaac confirmed with a laugh, hands on his hips as he openly and hungrily leered at them both. "I'm fucking my way through town... because I'm going to be the Harem Master!"

A couple of things happened at once.

Rarity started to babble as her mind overloaded with possibilities. "But that's- You- Oh my- That means- Master- fuck- friends- claim- but- ohhhhhh~!" Her wrist went up to her temple and she swayed on her feet like she'd just come down with a terrible fever.

Spike, telling the signs well before Isaac did, raced off at shocking speed and pushed over a long red velvet chaise lounge chair. It arrived just in time to provide Rarity with a soft fall as she dramatically swooned onto it, face red, eyes unfocused, voice stuck somewhere between excited giggling and murmuring incoherently. Her massive breasts pooled on her chest, barely contained by her blouse, and her generous rear lifted her hips up off the cushions by a good few inches.

Isaac just stared, stunned at this turn of events. "Ooooookay. I've never made a woman literally swoon before, I'll admit."

Ever the dutiful assistant, Spike had already run off and come back with a blanket and an ice pack, his oversized purple rump bouncing the whole way. Draping the blanket over Rarity's chest - forming more of a tent for her bust than any actual covering for decency, he said, "Kinda makes sense in retrospect. We all crave the Master, but Rarity... Out of anypony I know, Rarity's been fantasizing about having the Harem Master in her life the most and the longest."

"She's going to be okay, right?" Isaac asked deliberately, suddenly worried that he'd created too potent an appeal for himself.

"Oh yeah, totally, she just needs a few minutes," Spike assured him with a nod. He placed the ice pack on Rarity's forehead, and one of her hands raised up to keep it steady there. He then stepped away and looked to Isaac. "She's... chased after a few Prince Charmings trying to find the one, y'know? Even I wanted to be that Prince Charming at one point... until I found another path in life." He wiggled his cute, fat buttocks for emphasis. "So yeah... this is pretty much her wildest dream come true, but she's also probably gonna be super worried about messing it up somehow."

Isaac frowned in concern. He wanted all the beautiful women of this world to be really into him, but he didn't want them to have full-on anxiety attacks because of him! ...If for no better reason than because that was too damn relatable and this was supposed to be his perverted utopia, darn it!

"So you're really shooting to become the Harem Master, huh?" Spike asked casually.

Broken out of his reverie, Isaac jumped a little and nodded. "Y-Yeah. Still kind of working on my stamina, but... I've fucked my way through the Princess sisters and half the Elements of Harmony and the spirit's still willing, so I feel like that's a good sign."

The male shortstack dragon shivered at that description, his panties distending a little with the presence of his own endowment. "...Fuck. Yeah, you might be the one alright."

"Look," Isaac said, rubbing the back of his head sheepishly, "I feel like I've started on the wrong foot here. You know her best. How can I make it up to Rarity and get our Master-**** relationship started right?"

Spike tapped his chin a few times in thought.

"Million... billion... concubines... Oh, OH, Spike, I'm so sorry!" Rarity shouted as she returned from her fainting spell, jolting up to a seated position. "I must have been working too hard; I had a vivid fantasy about the Master in the middle of... of..."

Bobbing near her cheek was the hard tip of Isaac's massive human cock.

Rarity gasped deeply as she beheld the human, totally nude, hands on his hips proudly, cock pointed straight at her. Spike was crouched in the shadow of that cock, booty stuck out proudly as he used his long, forked tongue to tongue-wash Isaac's gigantic balls. But that tip so close to her face made her big sapphire eyes go nearly cross-eyed trying to focus on it.

Isaac chuckled at her reaction. It would never get old. "Sorry for giving you a fright, Rarity. To me, this was just fucking around and having fun with a bunch of beautiful mares, but I carelessly forgot how important this is to some of you. Please, let me prove to you that this is no dream, that my cock is the real deal, that I deserve to be your Master."

"I-Isaac...?" Rarity mumbled, turning around to face the human's cock in front of her equine muzzle. She reached out and grabbed hold of it just beneath the head, almost leaning into it for support, her warm breath brushing over his tip. "The human from another world... is really, truly going to be our Harem Master...? And- And where did this cock come from?? You weren't this big the whole time, were you...?" Despite her incredulity, her hands began to stroke him instinctively. Her fingers and palms were amazingly soft and smooth, giving him the best handjob he'd ever imagined.

Groaning as he held back his lust just enough to focus, Isaac said, "I've been steadily growing this whole time. I just didn't know what to do with it. But Celestia explained the situation to me, and now I know. And I want it. I want all of you so badly...!"

"And he's no bottom pretending to be a top, either," Spike assured her with a smirk as he massaged Isaac's balls with his small, scaly hands, acting as Isaac's fluffer for the moment. "Twilight, Rainbow, Pinkie Pie, the Cakes - you can smell all of them on his cock, and that's probably just the ones he fucked today!"

Rarity's eyes darted between Isaac's face and the tip of his cock a few times, taking in all of this overwhelmingly enticing information. She gave into her urges for a moment and took the tip of his cock into her mouth, moaning around his head as she tasted his cock and let some of his precum flow onto her tongue, which she licked up like drops of water in a desert.

Then she pulled back, panting with desire, and looked up at the human. She looked both hungry and nervous in the ****. "Isaac... If you're serious... if you want me... then I... I..." She slid off the chaise lounge and down onto her knees. Her horn glowed and dismantled her blouse and skirt, leaving only a set of lacy black lingerie trying to hug her outrageous hourglass figure. And through it all, Rarity's focus remained entirely on Isaac. "I'm afraid I can't help but impose on you a little, and I apologize in advance if it becomes any burden..."

Isaac tilted his head a little, but she had his curiosity now. "What do you mean?"

Rarity took a deep breath, and then looked firmly up at him with a burning need. "If you're going to claim me, Master, then I want you to claim me utterly. I want to submit to you in the fullest in every way I can. I'm... I'm hungry for it. I'm starving for it. The true domination of a real Master...! I want you to own every part of me. It's selfish, but I can't deny my desire! Everything I am, everything I own, every possible thing that is tangentially related to me - I want you to take it all and use it for your own pleasure! Make me your whore, your slut, your bitch! I want to be nothing more than a plaything for you, Master! If all you want to do is grope my tits, go away, and then come back whenever you want to rub your dick on 'that white unicorn bitch,' that's all I could ever want right there! Do you understand? I don't think I can go into this and just be casual sex friends while playfully calling each other 'Master' and '****.' I need to mean it. I want to call you Master and know that you're the controller of my body, my life, my world. I know that's a lot to ask, and you're still traveling on the path to becoming a full Harem Master, but..." Rarity's sapphire eyes shimmered as she pleaded with him. "...please? Will you do me this favor?"

Spike stopped massaging Isaac's balls and looked up at him past his cock, one eyebrow quirked as if to say, 'Well? Are you going to disappoint the lady?'

Needless to say, Isaac was a little stunned. Needless to say he'd never had the emotional desire for submission laid out to him before. It was something that had never come naturally to him - he just wanted to be a lazy tyrant, after all. But now he was getting a sense of the responsibility of the dominant, how the needs of the submissive could dictate the rules of engagement. Despite presenting every lazy jerk's juvenile fantasy of a willing sex ****, there was a genuine emotional weight to her pleas that made him pause.

It was only a few moments' pause, though. A grin slowly formed on Isaac's face.

After all, who was he to say 'no' to a nice lady's request for total sexual domination?