Fandom: Steven Universe. Idea: Greg working the 'universe charm' on the other diamonds. You can blame the youtube video of the same name and also a friend of mine on Discord for this, lol.
Greg had first been with Blue Diamond on their way to the human zoo.
Terrified and confused as he was about what was happening, he had managed to keep his cool and kept talking, acting like he wasn't two seconds from jamming every button he found until the ship either turned back home or shot them all into space.
Blue Diamond set him back down near where she sat in her ship, and they continued to talk like they had been before the abduction-which he was very careful to avoid calling it.
The longer they talked, the more Greg managed to defuse the situation. Little as he knew about gems and diamonds and all this syfy nonsense, he knew how to keep a conversation going. And luckily for him Blue Diamond desperately needed someone who to talk to with a relaxing aura about this.
She'd been so emotional and coming apart for so long that it was almost surreal to finally be relaxing.
Picking up on this, knowing that his best chance for not getting locked up in what 'the zoo' was to ingratiate himself to her, and with no other cards he could be pull on such short notice, he mentioned as casually as possible that he knew a way of, well, relaxing. One that also made the quiet moments more interesting.
Curious, Blue asked if it was some kind of human game. Greg nodded, and suggested she shift down to a less... giantess size for it.
Blue nodded, and began to glow as she shapeshifted, moving down until she was just taller than the funnily little human man, curious to see what his game would be.
Breathing a mental sigh of relief that this was looking like it was gonna work, he suggested that she next remove her clothes.
Blue was a little surprised by this, but when Greg did so as well, she realized it was apparently necessary for the game. She removed her cloak, letting Greg see her full body. Greg's brain nearly shut down momentarily as he looked over her absolutely beautiful form.
No one would ever be more beautiful than Rose had been in Greg's mind of course, but damned if Blue didn't come close. But he had to stay focused, had to make sure she wouldn't want to throw him into what he was convinced was some kind of weirdly named alien prison.
Following Greg's instructions, Blue sat down with her legs apart, allowing Greg to move down between them.
Blue's eyes widened at the sensation as Greg set to licking at her slit, hoping that the old skills hadn't left him.
If the sounds Blue began making were any indication, they certainly hadn't. Blue gripped the chair on either side of her as Greg tended to her, biting her lip to try and keep herself as quiet as possible; a futile effort ultimately.
Nearby, as Greg showed Blue all the tricks humans had developed to bring pleasure, Blue's Pearl was watching. She was unsure what it was exactly, but it looked rather interesting, and so she set to documenting the event by way of drawing it on her screens.
The fun did nothing to stop Greg getting thrown into the Zoo, but on the bright side, he would later be able to say he had been with two diamonds instead of one.
As much as the old Universe charm had rarely failed him, Greg didn't believe for a second that he could have made any progress with Yellow Diamond without very specific circumstances, or without Blue's help.
The two had arrived together in order to free the cluster and destroy the planet. The Crystal Gems attempted to fight them off, and when the Cluster was free, it did the same against Yellow's ship before returning to its bubble. Greg... wasn't really sure about what followed. Some metaphysical stuff with Steven's powers.
All he knew for sure was that, after Steven woke back up, Blue and Yellow knew the truth about him having Pink Diamond's gem, and shortly after that, they knew the whole story about Rose having actually been Pink, how she'd wanted to save the earth, how Rose had been the person Greg had mentioned to Blue.
Upon recognizing Greg, she tentatively asked if Pink's staying had had anything to do with the things Greg had showed her. Greg laughed and started to say that that had had nothing to do with it, only to stop when he realized he wasn't actually sure.
If the things she and Pearl had told him were true, Rose's fun with humans back in the day had at least been a factor.
Yellow, determined to understand this, shooed the others away for the time being so she could 'interrogate' Greg, only Blue remaining so that she could be sure Yellow didn't actually hurt Greg. At Greg and Blue's explanation, Yellow shrunk down and undressed.
Her body was just as perfect as Blue and Pink's, albeit from a more 'literally carved out of stone, Olympic body builder' stand point, somehow compacting enough muscle to bench press a small suburb while maintaining a still feminine figure. Blue explained the essentials of the 'game,' and Yellow quickly determined that she would be having none of this being on her back or stomach nonsense.
If all that was needed was that object A enter entrance B, she would maintain a dominant position throughout. Greg, not wanting to take any risks after watching what she was capable of, agreed immediately, remaining in a sitting position as Yellow dropped herself like a heavy weight crashing to the floor into Greg's lap.
He suppressed a cry for help as pain shot through him, pleasure chasing it as Yellow began to ride him, holding onto his shoulders with just under the force needed to powderize the bones. Yellow grit her teeth as her hips moved relentlessly, only picking up the longer she went, the more she felt.
Evidently wanting to feel more, Yellow instructed Blue to wait out with the others while he 'investigated further,' assuring her that she would, and Greg would never forget the phrase or the mix of fear and curiosity it sent through him, 'at least attempt to avoid damaging the human in any permanent way.'
White Diamond... there was an encounter Greg had not and suspected he never would be prepared for.
When the gems all returned to earth, Greg let out the biggest sigh of relief of his life, hoping that maybe now, maybe, finally now, the fighting and disasters could stop. Things seemed to finally be stable.
It wasn't long before Yellow and Blue had introduced White to Greg, and more to the point, his game. She had been as unsure as Greg suspected all gems were at first, but she'd taken to it like fire to a dry field; quite stunningly so in fact.
Once gems got started with sexual things, it never took them long to find what it was that they liked. Blue liked being pampered, Yellow being aggressive, Rose had liked... well, Greg felt it impolite to mention, but suffice to say she'd not exactly been a picture of innocence.
And in a surprise to Greg, a surprise to anyone who would find out, White evidently liked being mistreated.
It was surprising the first few times, but he'd long since decided not to question it. White Diamond visited a few times per month, and it was the same routine each time.
The moment they were behind closed doors, White would shrink down a manageable size-though still an amazon by human standards-and wait for Greg to give her orders, to spank her, to insult her, to tell her what things he wanted her to do to please him. He hadn't been comfortable ordering her around at first, but had eased into it.
Knowing that she liked it made it easy of course, but it was still something he only really did with White and- ahem, anyway.
Greg was just happy that things were calm now, and glad that the Diamonds tended to prefer visiting him one on one, not believing for a second that he could survive an encounter with all three at once...
May end up writing about this again and going into more detail. This was more to showcase the idea and appease a friend, lol.