Rin wouldn't try to summon a random servant without a precaution or guarantee that he or she doesn't try to work against her, true there is the command seals but those are a valuable resource that only can be used 3 times.

Luckily for the Tohsaka heir she found a scroll inside a sealed box which describes an alternate version of the summoning ritual, but instead of summoning a servant the caster would recieve all the abilities and parameters of the servant but only works on human females, which is something that the girl needs as the possibility of being betrayed would be down to 0.

At night

Rin Tohsaka stares at the summoning circle on her basement in disbelief, she did everything that the scroll said and still nothing happened, no servant and nothing different in her body.

"Aaarg!, I should have know that was a scam, if not I would have heard about one of my ancestors using it!" Raged Rin as she throws a tantrum

"Now I losed my opportunity to participate.."Mumbled the Tohsaka as her rages dismisses leaving her depressed

*Grumble*

The sound of her stomach rumbling ominously distracts Rin from her depression "Huh, I must have forgotten to have dinner in my rush to have everything for this scam of ritual" she rubs her belly.

The Tohsaka without anything to do goes to the kitchen of her house but as she passes through the living room something happens...

*GRUUUMBLEEE*

"Uuuh, I feel that I am about to explode" moans painfully the young woman as she feels something building up from inside her body.

*BUUUUUUUUUUUUUUUUUUURP*

A literal explosive burp passed through the lips of the girl which destroyed the mayority of her living room.


"Oow, that hurt, why everything is so dark?" Said Rin as the burp also destroyed the light sources in the living room

But as she tries to conjure a ball of light

*Flash*

"KYAAA"

The ball was so bright that it could be confused as the sun on a sunny day, the poor Rin was surprised by the sudden flash.

"W-what!, but I didn't overloaded the spell, i put the same quantity of prana as always" exclaims the Tohsaka.

Now that the girl adapted to the sudden brightness she proceeds to look around the room calculating the damage

"Tv, table, 3 chairs, the roof, the sofa, the porcelain, mmm what is this?" Rin spots something red on front of her vision, that is her shirt!

"Why my shirt is stretched?" Questions the girl as she grabs the shirt feels that there is something below it, she touch it and feels a bit of tickles, immediately she pulls her shirt and sees a pale orb of skin.

Is her skin!

And also that orb is her belly!

"I must be dreaming, yeah, there is no way I became this big"* pinches herself* "Damn it!, That stupid ritual has done this to me, there is no way this could be this happening!!" As she rages she punches one of the walls without using Reinforcement and what happens surprise her.

*Crumble*

"How?, I didn't even apply Reinforcement, there is no way I could have destroyed this wall" astonished the girl starts to ponder about what is happening.

She sees the ruined sofa and proceeds to lift it with one hand

"Incredible" mumbles the girl and starts to think something and then she proceeds to point her finger at the ruined table

*Gandr*

*Boom*

The table was totally disintegrated and in it's place there is a small crater

"This must mean that the ritual WORKED!!" The girl jumps of happiness jostling her belly until...

*Growl*

A genuine growl of hunger resonate through the room

"Oh forgot, the dinner" reminded herself

As she walks to the kitchen she couldn't stop looking at her belly, for some reason even with this size she doesn't feel any extra weight, feeling discomfort or even hinders her movement even when her belly is in the size that could contain a grown adult and also she can still feel hunger as if whatever is inside isn't considered food.

She reaches the kitchen and as it were an instinct she starts to cook a feast, she notices that she started to use Graduation Air to conjure cooking utensils which puzzles her as usually when a magus uses this spell it doesn't have the capacity of being used or even last long.

Later...

"I must have outdone myself..." Says Rin while looking at the pile of food on her table in the kitchen.

"Well, I can save the leftovers in the fridge" shrugged the young woman as she proceeds to eat.

As she takes her first bite her tongue is flooded with flavors.

"This is good!" Exclaims the Tohsaka as she forgets any manners and start to eat whatever food she gets in front.

30 minutes later

*Burp*

"Oooh, I never ate something like this" the now bigger girl is at the chair cleaning her teeth with a toothpick.

*Yawn*
"I must go to sleep" mumbles the Tohsaka as she stands up and walks towards her room with her belly sloshing it's contents

While walking the girl was pondering why now her food tastes so delicious this is not a skill she possess and also why the conjured kitchen utensils can be used or last long.

Then she remembers, the scroll said that the caster would be able to use the skills and parameters of the servant that was going to be summoned.

It means that she is tapping the power of her servant all this time!

At this Rin just chuckles, if she possessed enough energy she would have done a maniacal laught, she can't wait to start the war.

She goes to sleep, dreaming of her city engulfed on cursed fire and a broken man saving her...

Next day

Rin awakes not without destroying her alarm with a Gandf with her nightstand included and prepares herself for another day at high school

Until

"I can't go like this" says Rin seeing her reflection on the mirror, her shirt is covering the top of her belly and her bellybutton is exposed with the rest of her abdomen

"Mmm, i think it is better if i don't go anymore, I am a magus and eventually i would go to Clock Tower, mundane education won't do much for me in that place and also the war is about to start, i can't expose myself to the other masters by going to the high school" reasoned herself with a nod

She proceeds to collect her gems, uses a spell to make people ignore her and goes out of her house.

"Ready or not fellow masters but Rin Tohsaka is ready for this Grail war!" Exclaims mentally the young woman strolling confidently through the road


Meanwhile inside Rin's stomach

Archer could only curse Alaya and his E-rank luck for this predicament.





I found this Rin Tohsaka sprite and couldn't resist to feed the tsundere with her favorite prey: Shirou, thought this one is a bit fermented from the original


Original sprite work
https://www.pixiv.net/en/artworks/42626021

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