The I-Expo. The pre-eminent convention showing off the latest and greatest innovations in technology developed on I-Island. An extra-national territory, a man-made island built specifically for the purpose of creating a place where scientific achievement wouldn't be hampered by government bureaucracy. It was this island where the greatest advances in support equipment were made. A haven for some of the most brilliant inventors in the world.

Not really something in Saiki's interest. But, he had an invitation with a plus one for winning the UA sports festival. And Momo was already going since her family were on the board, bringing Kyoka and Ochako with her. Plus... Well why not, right? Some support equipment wouldn't be a terrible idea even if he prefered the feeling of managing on his own. Something to supplement his abilities. Maybe by going he'd find something that would catch his interest. Really, he was only going for the sake of his future hero career. Definitely not because his girlfriend and their maybe/maybe not other girlfriend were going and he could maybe convince them to share a hotel room. And definitely not so he could take Katsumi as his plus one and rub it in her face.

And he definitely wasn't taking a little extra glee from Momo's decision to be an amazing girlfriend and bump him up to first class with her, leaving Katsumi to sulk angrily in coach. Of course he wouldn't do that. He was a hero. That kind of smug satisfaction was beneath him. He was perfectly happy sitting in his comfortable chair with a glass of orange juice (with ice), offering a smile to his wealthy, beautiful, buxom, genius girlfriend as she relaxed into the neck massage her pillow gave her. Yes. Being smug was for lesser people.

"Wow!" Ochako breathed as she looked out the window from her window seat across the aisle from them. "Is that it? It's beautiful!"

Kyoka looked over her shoulder and hummed in agreement. "You wouldn't think scientist types would care that much for how a place looks. Guess the people running it have good taste."

"You shouldn't stereotype," Saiki commented without much recrimination in his tone. Partially from being so relaxed, partially for not caring that much if she stereotyped people. "Most people want to work in someplace comfortable and the ones that don't care, don't care. Besides, with the expo being hosted there they want it to look good for the guests, right?" He took an exaggerated sip of his cool drink. "Gotta work hard to impress us guests."

Kyoka would have seemed unimpressed if it weren't for her smirk. "You're enjoying this way too much."

"I'm the champ," he countered, grinning smugly at her. "I think I'm enjoying this exactly the right amount."

She rolled her eyes, but also relaxed into her very comfortable chair as well as the plane came in for a landing.

After a quick trip through the airport the group meet up again before heading straight for their hotel to check in. The second they all had keys in hand, Ochako quietly swapped hers with Saiki before they headed up to their rooms.

Was this another bit of petty revenge on Saiki's part, putting the bitchy and aggressive girl with Ochako of the never-ending sunny disposition? ... No, actually. There was just no chance in hell that he would give up the chance to share a private room with Momo and Kyoka. He fully intended to make some magic happen on this trip.

The hotel room was a little outside of his plans, however. Namely, not a single room. Instead it was one room with a double bed and an attached room with a single bed. Presumably, the Yaoyorozu invitations expected a couple and an extra, either Momo and her parents or her parents and an attendant of some kind.

"Huh," Kyoka grunted, "Not exactly ideal but I guess it works out." She shooed Saiki toward the connecting door. "Go on, Saiki. We're gonna get ready for bed."

It was his turn to level a flat look at her. "Yeah, no. I think I'm exactly where I need to be."

"Saiki," the not-so-punk punkette retorted, "Two girls, one guy. It's obvious you should get the single room."

"Well," Momo interjected, unpacking her things since there was no doubt as to where she would be staying, a lacy red bra hanging from her finger, "Saiki and I are together so a," she blushed, puts a hand to her cheek and looked away, "A double bed would be..."

"Exactly!" Saiki grinned. "We have a double bed here. Plenty of space for all three of us!"

"What?!" Kyoka's eyes widened.

As did Momo's. "Oh my!" Though her interested smile suggested she felt rather differently about the suggestion than Kyoka did.

The more petite girl looked first at the triumphant Saiki, then at the clearly interested Momo. Her face turned an atomic red. "F... Fine! I'll take the single room!" Before anyone could try to convince her otherwise she grabbed her bag and dragged it through, closing and locking the door behind her. Both Saiki and Momo could hear the thump of her back hitting the door and her intense breathing.

Momo sighed in disappointment. "Your idea sounded fun."

"Don't worry," Saiki assured her as he pulled her into a hug, nipping at her bottom lip. "Kyoka wants it just as bad as you do. Just a matter of bullying her into it. Now," he picked at the fasten on her skirt, "How about we let her know what she's missing?"

"Oh, Saiki!" She breathed as she felt her skirt drop to her feet, her blouse hanging free over her thighs, doing a poor job of hiding her silk white panties. Her own fingers fidgeted for a moment before they went for his pants, unbuttoned them and then pulled away as they dropped. She felt the heat of his skin against hers as he pulled her toward him, but also the uncomfortable cold as her blouse rode up. "Saiki, your..."

He followed her eyes down to his metal jock. Grinned. "You want me to get rid of it? Aren't you forward."

"W-Well if we're going to be sleeping together... I prefer to sleep au naturale. In the nude," she clarified at his uncomprehending look.

"In that case," he flicked the buttons of her blouse open in a matter of instants before, "Whatever would make you more comfortable." He unlatched the sturdy garment, let it drop with a thud to allow his package to rise unrestrained, to press against Momo's belly.

"Oh," if the heat was pleasant before, this was almost enough to wipe thought from her head. Her arms slid out of her sleeves, her bra unfastened and fell, his shirt pulled over his head before she pressed herself fully against him. Wanting more of him. More of that intoxicating contact heat.

Saiki revelled in the feeling of her against him as his hands roamed. Her softness, her incredible curves, the eagerness of her seeking more from him. He stepped back, pulling her onto the bed with him. "Momo," he whispered to her between kisses, "tell me what you want."

"I want," she said, her breath hot against his skin, "I want you." She felt his cock throb against her body at the admission, felt his agreement and reciprocation. "But, I also want Kyoka. I want her to be here. With us." She looked away, ashamed. "I'm so greedy."

"You think I'm ever going to judge you for that?" he laughed. "Me?" He reached out to stroke her cheek. "You want her? We'll get her. You can lose your virginities together, how does that sound?"

"I... Yes," she admits, "That sounds wonderful!"

"It'll be just like I said way back when, my dark mistress," he told her, recalling a moment from so long ago, more or less when they first met. "I'll bring her to you to be our plaything. Would you like that?"

"Ohhh, yes!" she hissed, rising, her back arching, feeling his cock slide between her thighs, "That sounds wonderful my lord. Oh!" she squealed as she felt his hips thrust, sliding his cock against her labia. "Oh Saiki!"

"You can tease her right to the edge," he continued to spin the fantasy, "Watch her beg for release, flushed and desperate, soaked from sweat. And then we'll push her over together, make her ours forever."

"Yes! Oh Saiki!"

Through the door, Kyoka could do nothing but listen as Momo and Saiki unashamedly pleasured each other in the other room. All the while laying out their plans for what they wanted to do to her. Her hand and her jacks had long since began delving inside her soaked pussy. As she masturbated to her friends, she couldn't help feeling like the plans they were making sound pretty good.

"I am in so much trouble." Though even as she said it, her hips bucked as the fantasies continued to run through her mind.

-(-)-

The next day, the group of four wandered the expo together. Only four because Katsumi left the hotel before Ochako was even ready to meet up with the others. As they wandered in their hero costumes, they were surprised to see a few familiar faces. Iida as the latest in the long line of heroes from his family had taken advantage of the invitation his family had been extended. Todoroki likewise attended in place of his father. Kaminari worked a restaurant server job to get free entry to the expo. That last encounter genuinely surprised Saiki. Seeing the usually dense electricity quirk user working a service job of his own will caused him to treat the blond with a little more respect than he used to. It was a surprising sign of diligence Saiki hadn't expected from him in the slightest. Not that his nod of respect didn't confuse the hell out of Kaminari in the moment.

But seeing Kaminari was nowhere near as big a surprise as, "Izuku?"

The green-haired hero in training jerked in surprise, having been in conversation with the blonde girl next to her. "Saiki? Momo, Jiro and Ochako too?" she blinked in surprise.

"Are these friends of yours?" the unnamed blonde girl asked with a smile.

"Uhh, yeah!" Izuku confirmed with just a slight bit of hesitation as she looked at Saiki. "They're my classmates at UA. Why are you all here?"

"My family are shareholders for some of the companies with exhibits here," Momo answered. "So we were extended invitations I took advantage of. Kyoka and Uraraka are my guests."

"Oh, and because Saiki won the sports festival..."

"Right," Saiki nodded in confirmation. "But man, I thought you turned down being my plus one because you were still mad at me. You should've said you already had an invite." Only as the words were out of his mouth did he realise where that invite must have come from, leading him to quickly change the subject. "I brought Katsumi instead. She's... Around. Somewhere."

The sound and flash of a large explosion on a faux mountainside grabbed the attention of the group.

"Probably over there if I had to guess," Kyoka observed flatly.

"Hm, I think over there is the villain assault course," the blonde told them. "Would anyone like to check it out?"

"Sounds good to me," Saiki shrugged. "So Izuku, you gonna introduce us?"

He could see the uncertainty of whether she should written on her face. "Sorry. This is Melissa Shield. She's been showing me around since she lives on the island."

"Oh yeah?" Saiki responded with interest. "Nice to meet you, Melissa. So what's it like living at the hub of scientific advancement?"

"Is he doing it again?" Kyoka murmured behind them.

"I don't think so," Momo answered equally quietly. "I think he's just being polite."

"It's nice," the blonde gave a vague answer. "I'd probably get to live here anyway since my dad works here, but it's still an opportunity I can't just let pass me by. There's unlimited opportunities to learn here so if I want to follow in my dad's footsteps I have to study hard."

"Your dad?" Ochako piped up. "Wait... Shield... Your dad is David Shield?!"

"Yes," the girl smiled. "Is that surprising?"

"Not as surprising as Izuku not losing her mind asking you questions since she's such a huge fan of All MIght and all!" the gravity girl exclaimed as her arms flailed wildly.

The blonde just looked confused. "Why would that matter? After all, All Might–"

"Is our teacher!" Izuku quickly cut in, "So I don't need to fangirl over everything All Might anymore, right?!"

"You totally do though," Kyoka noted with a smirk.

"Come on, cut the fangirl some slack, huh?" Saiki pled on Izuku's behalf. "Let Melissa see it happen first hand." He glanced Izuku's way and winks, allowing both Izuku and Melissa to see it. A hurried and quiet conversation occured between the two girls as Izuku tried to convey the need for secrecy regarding All Might.

Finally, the group arrived at the villain assault course, only to see Katsumi standing proud in the stands.

"And another contestant fails to match Katsumi Bakugo's time of fifteen seconds! Is anyone able to outdo this explosive UA student?!"

"Oh," Saiki uttered. "Oh." Again, this time sounding like he had reached some kind of epiphany. "Oh, it is on now."

"Not again," Izuku groaned. Now that she knew the context of what was going on between her ex and her childhood friend she couldn't ignore it.

"What's up, Saiki, Deku, pink cheeks, tits, jacks and other girl!" the bomber grinned at the assembled group, and especially at the boy grinning back at her. "Who wants to take a shot at beating my time?"

Saiki opened his mouth to volunteer–

"I will!" Izuku shouted with her hand raised. "Yeah, I'll do it! Sign me up!" she exclaimed, jumping down to the starting line.

"We have another contestant... Izuku Midoriya from UA, Japan, determined to outdo her classmate!"

Determined to interrupt Saiki and Kacchan's flirting more like but sure, Izuku thought to herself. Beating Kacchan would be okay too.

"Course is reset! Ready! Go!"

Once again displaying the speed and agility she had become capable of after her internship, Izuku blurred as she flashed from one target to the next, demolishing each one in a single hit.

"Wow! And in a stunning display of speed, Izuku Midoriya clears the course in a blistering sixteen seconds!"

"Darn, so close!" Ochako groaned.

"My turn!" Saiki announced as he jumped down, unable to wait any longer.

"Ah... Okay! We... Have another challenger! Please give us a moment to reset the course!"

"Do your best, Saiki!" Katsumi 'cheered', her tone making it more of a warning.

"You better hope I don't!" he shouted back.

"Okay! Course is reset! Now challenging is... Saiki Saisei from UA! Ready! Go!"

He had been watching from the stands as Izuku took the challenge herself. Saw where all of the targets were and came up with a plan. He wasn't as fast as Izuku, nor capable of as much rapid destruction as Katsumi so he had to play this one smarter. He headed straight up the mountainside and grabbed the top target. He didn't destroy it, instead he leapt into the air with it and then smashed it into pieces. What followed was a rain of precision destruction as he grabbed the robot chunks and threw them like bullets at the other targets one by one in rapid succession. He landed with one still in his hand, throwing it over his shoulder as he jumped back up to the stands.

"Alright! With ingenuity and skill Saiki Saisei matches Katsumi Bakugo's time of fifteen seconds!"

Saiki's smug grin fell. Katsumi frowned. Both looked to the announcer. "Who was faster?" Saiki demanded with disturbing intensity as he leaned over the railing.

"Uhh..."

"Spit it out, lady!" Katsumi shouted.

The poor announcer reared back in fear. "Fuh-fifteen point two four for Saisei, fifteen point four seven for Bakugo?"

"DAMMIT!" Katsumi roared, dropping to her knees.

"Ahh," Saiki sighed in satisfaction, patting the bomber girl on the shoulder. "Well, you did your best Katsumi."

"Congratulations, Saiki!" Melissa cheered him.

"Thanks, and hey," the blue-haired boy looked to the green-haired girl as she appeared distinctly uncomfortable, "I couldn't have done it without you, Izuku."

"Yeah... I'm... Super happy for you..."

"And with a blistering time of only fourteen seconds, Shoto Todoroki takes the top spot!"

"NOBODY CARES, ICY-HOT!"

-(-)-

One last visit to the hotel to get changed and ready for the formal reception. The last event before the expo would open to the public. Both Saiki and Momo went through their final preparations in their underwear as they got ready. Hanging on the wardrobe were their outfits. A black suit with blue waistcoat provided by Momo's tailor. A lovely pale green dress. And–

"You stole my dress?!"

"Stole is such an ugly word," Momo deflected, holding Kyoka's outfit for the reception over her arm. "After all, it's right here, isn't it? Ready for you to put on once you're out of those clothes. Ohohohoho!" the shameless heiress laughed in an exaggerated manner.

Kyoka's eye twitched as she glared not at Momo but at Saiki. "This is your fault."

"Obviously," he rolled his eyes. "But don't just blame me." He grinned, looking her up and down. "She wants you to bare it all for us just as much as I do. What's wrong, Kyoka? Afraid to be bad?"

Her fists clenched as she blushed. "You can't just, just say stuff like that and expect me to go along with whatever you want!"

"You're right," he agreed with her readily, moving toward her. She took one step back, and one step only, letting him move around behind her. "I can't and I won't. Because Kyoka," he lay his hands on her shoulders, "I know I don't need to." Leaned over her, spoke softly in her ear. "Did you think I didn't hear you last night? Listening in? Playing with yourself as you heard me fuck Momo's luscious thighs? You want this Kyoka. You're just scared to admit it. Don't worry," his fingers pulled at her jacket, sliding it over her shoulders, "I'm happy to give you what you need even if you won't admit it." Her jacket slid off, leaving her in her ripped tee and pants. Her nipples making tents in her shirt. "Just say yes. Just give in. That's all it takes to get what you want."

The punkette licked her lips, hearing Saiki's sinister words, seeing Momo's desire for her. For her. The same desire she had heard the night before. She swallowed. "Okay."

Momo didn't quite cheer even if her glee was obvious.

"Well then," Saiki purred, unfastening her pants, "Let's get you undressed, so we can get you dressed." Kyoka was unresisting as he continued to strip her down, removing her shirt to leave her bare chested. "When we come back to the hotel, you're going to be staying in our room, do you understand?"

She nodded shakily as Momo approached her. "Y-yeah, I understand."

"Oh Kyoka," Momo cooed with a beaming smile as she wrapped her friend in a smothering hug, "We're all going to have so much fun together! I can't wait!"