A fun little idea I've had for a while now. It's rather short so I just decided to type it out today. It's short but I had some fun with it
Something I've found amusing and wanted to work with is that all the LB girls (and everything tied to LB in general) is so weak and pathetic that even Ritsuka can kill them easily. So Expect to see this kind of LB bullying because oh boy do I have ideas on how to bully the LB girls.

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Mash sprung forward, her shield crashing into the head of a giant, shattering its skull like glass. The lumbering giant crashed to the ground in a pool of blood. Another of the monsters of Norse mythology lunged forward only for it to die in a single strike of her shield. With a spin, the cannon barrel extended from the bottom of the cross-shaped shield, a thunderous bang erupted as the blast tore through several more giants.
Mash brushed her purple bang away from her eye, she looked over the piles of bloodied lifeless corpses amidst the snowy wasteland.
"These are the giants rampaging across the world? How are they a danger? I think a one-star servant could deal with them." she sighed rocking her neck from side to side with a loud crack. Her attention was brought back to reality when one of the jotuns slammed its fist into the back of her head with a crunch. The giant roared in pain clutching its broken hand, a pain that was quickly ended when Mash brought her fist back into the monster's head killing it.
"I hope Senpai's alright, there are a lot of monsters around." Mash groaned, she'd barely finished her sentence before she saw an entire squadron of valkyries shooting through the air. Their golden wings illuminated the sky as they moved.
"Find the Master of Chaldea, the shielder is to be left alone!" one of the valkyries bellowed.
"SENPAI NOO!" Mash cried. She spun around on her heel, she had to save Ritsuka before it was too late.

Mash sprinted as fast as she could, she had to save him. As she drew close she could hear screaming and clattering of metal. She was running out of time.
"SENPAI. NO!" Mash cried in horror.
"Queen Skadi! Help, Save us!" one of the valkyries screamed as her body was dragged down Ritsuka's massive engorged throat. The young mage hung more than twenty feet in the air, his stomach bloated and bulged with screaming faces and squirming bodies.
"Senpai. Think about your diet," Mash whined, stepping over the piles of discarded shields spears and broken armour. "One or two is one thing, but you know that you start putting on weight with more than four, and how many did you eat this time?" she poked his stomach with a defeated sigh.
"I know I know. But they just taste so good, and they're so helpless. I mean even I can kill them, it's pathetic, really. I mean, being this weak? Tasting like ice cream and digesting in minutes. If I didn't know better I think Skaldi made them to be as easily eaten as possible. I can already feel some churning away." Ritsuka laughed, his stomach roaring as it reduced the army of divine women to nothing but mush.
"I know Senpai, but it took hours to burn off all the weight you got from the last squad. How many did you eat this time?" Mash shot an annoyed glare up at her beloved senpai who let out a belch so loud it shook the ground. In the distance, the two could hear glass shattering from how loud it was.
"I stopped counting after seven." the bloated mage chuckled.
"Senpai!!!!!"
"For the love of Freya! Let us out! We're sorry! We'll serve you, please just don't digest us too!" one of the devoured valkyries screamed, her face pushing against Ritsuka's gut.
"Jeez, they're so loud and whiny. Mash, I can't reach. Can you take care of that?" Mash obeyed and smacked the stomach sending the helpless warrior woman tumbling into the digesting pile of her sisters.
"Senpai, it's going to take you at least three hours to burn off all the fat you get from them. You can't keep doing this." Mash groaned, despite her complaints, she laid her head on the blubbery belly with a contented smile.
"I know, I know. A moment on the lips an hour on the hips. But they just make such good food. Besides, I have a hunch you're the least interested in if I'm putting on weight." Ritsuka chuckled.
"Ahhhhhhhhhhhhhhhhhh...this...this...isn't about me," Mash stammered and stuttered with a bright blush. She was in awe of her bloated senpai, his scruffy black hair, his soft pale skin, and his mischievous blue eyes that were always paired with a playful smirk when teasing her like he was. The worst part was he was one hundred percent right, she enjoyed him being fat from these weak Lostbelt women, no matter how much weight he gained she loved every inch of him, it was just more to love, more to hug, to caress, more to...
"Mash, are you thinking lewd things again?" he cooed teasingly.
The shaking shielder didn't want to answer that question, instead, she just buried her face deeper into his fat even though she knew it only confirmed it.

"Kill the master, but leave the girl! Ophelia wants her unharmed!" a woman's voice called from the sky.
"Ummm, does anyone else see how big he is? Or the many spears on the ground? I think this is a bad idea."
"CHARGE! FOR ASGARD!"
Ritsuka and Mash both groaned, a glance to the sky revealing another squad of valkyries.
"If any of you live past the next hour, TELL YOUR BOSS TO STOP TRYING TO STEAL MY WAIFU!" Ritsuka roared in anger.
Mash reluctantly pried herself from the heavenly soft blubber of the man she loved with a groan.
"Stupid Valkyries, ruining my time with Senpai again," she grumbled as she plucked her shield off the snowy ground. "Senpai, please just think about your diet and try not to eat them all."
"Ahhh, but that's such a waste to just kill them. Maybe you should eat them instead, then so they don't go to waste." he taunted. In the short time since Mash had failed to save him from ruining his waistline, he had already long digested most of the warrior women. His bloated twenty-foot stomach was now not even a quarter of its former size. He rocked himself to his feet as best he could with a teasing laugh.
"We'll.....We'll see Senpai." Mash grinned as the two readied for "battle".