Trailing behind the other girls as they left the rollercoaster, the dual-haired archiver looked behind her at her senpai. This wasn't the first time she had interacted with Haachama, especially when her senpai kept her company in Japan between their cooking stream and various outings, but this was also the least-dressed that she had seen the blonde girl as the rollercoaster engineer was dressed in nothing but a towel.

As Shiori kept falling behind and eventually to a stop, she gave a small call to her fellow genmates. "You guys go on ahead, there's something I need to talk to Haachama-senpai about. I'll catch up soon~" While the dogs and Beebs quietly acknowledged her, Shiori saw a look of doubt for just a moment in Rissa's eyes. If there was anyone who knew what she could get up to, it was the demon of horniness, although it wasn't like Neri didn't have her own fun with their various senpais. The raven's mouth opened for a moment but Shiori saw her shake her head and catch up with the others as the archiver made her way back to the rollercoaster.

A deathtrap like that had gotten her heart racing, and seeing Haachama bending over a lectern with her huge ass hanging out of her small towel got something else stirring in Shiori as she quietly snuck up on her senpai. Haato seemed to be writing something and as if that wasn't enough to charm a lady like her, she held her breath and took a look over Haachama's shoulder to see: "I'll get them to be my girl friend someday." Her senpai's broken english was so adorable to her, and if Haachama wanted her as a girlfriend so badly...

"Kyaaaaa! Shiowi!" Her senpai's cries as Shiori used one hand to grope Haachama's butt and the other to grope one of her breasts was like music to the archiver's ears. Even for how generous her senpai's curves were under the towel, actually getting to feel how sizable her tits and ass were made her erection even stiffer as Shiori wondered if Rissa had ever gotten her this turned on before. But no matter what, her large cock was already almost bulging out of her panties as Haachama whimpered more. "This... th-this is hentai! We can't do it out here..."

For some reason, even when she was usually more dogmatic grammar-wise, something about her senpai's broken fluency of the English language was too much of a turn on for her as she pulled her hand from Haachama's big booty to lift up her dress. "Oh, don't worry, don't worry~ There's no one around, and I really wanted to thank my dear senpai for such a fun trip on our rollercoaster. I think Beebs mentioned you needing more rails, and I can provide that to you." Through her panties, Shiori's bulge softly rubbed against the crack of her senpai's asscheeks, already feeling herself dew from this sensation alone.

All the while, the archiver felt her senpai writhe in her arms, but Haachama never pushed her away. "Still... but since it's you, Shiowi..." Even if her senpai could be so confident in the kitchen, it wasn't like Shiori hadn't done her reps beforehand to see her senpai's weak spots. If Haato was on the offensive, there would've been nothing she could have done, but as the stiffness of her cock escaped her underwear, the dual-haired girl's surprise attack was enough to have senpai leaning against the railing in front of multiple signs of the rollercoaster's doom.

Haachama's rollercoaster didn't have very high of a survival rate, but that was nothing compared to how terribly her senpai's pussy would survive as Shiori pulled off from the blonde's asscheeks and skud them between the thickness of Haato's thighs. Resting the front of her dress on Haachama's towel, Shiori freed her hand up to reach around her senpai's stomach as she felt that chubbiness too. "Oh wooow, your tummy is as soft as everyone says. Although I guess all that cooking had to go somewhere, and I can feel it now." The blonde's usual giggling was overtaken by whimpers as Shiori slowly but surely put her cock into Haachama's pussy, although the archiver steeled herself as its grip almost made her burst already.

Her overconfidence would be her downfall, although perhaps groping her senpai didn't help when her other hand was still enjoying teasing Haachama's boobies. Shiori's fingers pinched Haachama's nipples as her hips gotten into the groove of plunging in and out of her senpai's vagina. The strongest idol of Advent was fucking the strongest idol in the world, and Shiori couldn't be anymore proud as Haachama seemed to have the strongest pussy in the world too from the way it tightened around her cock. If anything, Shiori felt herself huffing and puffing faster than she expected as one of her eyes twitched and her thighs began to shake.

Despite her surprise on her senpai, Shiori felt a sense of dread when Haachama reared her head toward the archiver and she saw the smug smirk on it. Before she could try to bring her dominance back around, Haachama's pussy clenched once more and Shiori couldn't stop herself as she felt a strain in her balls. No amount of holding back would prevent her from orgasming in her senpai now as she busted a fat nut in Haato, more than enough to get her senpai pregnant if her sperm was even strong enough to impregnate her as Shiori learned while Haachama truly was the greatest idol in the world despite how hentai she was.

More and more of her balls drained out into her senpai until Shiori's knees weakened and it took her a moment to recover her strength enough to put out. Haachama's pussy was dripping with her cum as some of it leaked onto the grass below them. However, instead of cleaning up, her senpai just straightened out her towel as Shiori push her well-satisfied cock back into her panties and replaced her dress. "Ah, hope you enjoyed the ride, Shiowi~ Come back again anytime, and bwing the others too! Eheheh!" That giggle was ever so charming from her senpai as Shiori moved to catch up with the rest of the girls, all she did take a peek back to see Haachama reach a hand under her towel. At first, she thought her senpai was actually cleaning up, but then Haato moved to lick a white-covered finger as Shiori wondered if she could match her senpai's depravity. Guess she'd have to find out eventually~