Kuro roamed the halls of Chaldea bored and slightly exhausted from numerous XP gathering missions
"Master was a slave driver today And what was with that big belly of his? No mash either, ugh today was weird I need a nice magical snack Or a nice meal. I wonder if Illya is still in her room?" the archer grinned mischievously as she thought of her sister's lips and magical energy. She took a step and teleported in front of Illya's room, she opened her hand and created the key before unlocking the door. Soundlessly the archer made her way into the young caster's room and finding her target asleep.

She crawled onto the bed looming over her sleeping sister.
"Illya wake up. it's time for supper." Kuro cooed trying even now to seduce her sister. Upon hearing it was time for supper Illya shot up towards Kuro's face.
"Food?" was all the young girl got out before her head forced itself completely into her assailant's mouth. Both girls were caught off guard by this, Illya immediately began to whine and cry to be let out Kuro however was greeted by a sweet almost vanilla-like taste in her mouth. Ignoring her little sister's pleas the archer shrugged and took a big swallow pulling more of the magical girl into her mouth, taking time to savour this golden opportunity by licking her wailing victim all over as she slid into the awaiting gut.
"Kuro this isn't funny, stop it. If you let me go you can have all the chocolate that other red archer gave me, doesn't that sound far tastier?" her pleas were simply met with another lick and a gluttonous moan. Kuro had already made her way to Illya's hips within just a few seconds yet she had tried to make the process take as long as possible. Another gulp brought the poor caster's legs flailing into the awaiting maw, by this point Kuro was almost sad that the meal was almost over. Within another few seconds, all that remained of the five star was her feet flailing outside the archer.
"hey, Illya we have a bunch of Assassins to fight tomorrow so I'm...." Ritsuka entered the room speaking before freezing at what he saw. Kuro simply smiled around her preys feet before taking a final swallow and letting out a satisfied sigh
"Sorry but she's not going to be available tomorrow".
Ritsuka sighed "You better not digest her Kuro, or Gorgon help me." Kuro grinned
"And lose my best mana supply Master I'm hurt that you think so little of me. Though I think I just figured out were mash was today." Kuro pointed at her master's own large stomach. Ritsuka glared at the archer before turning to leave.
Just make sure you don't digest her and that she's out at some point tomorrow, you can eat her again after that for all I care," the man replied before leaving the room.
"You hear that Illya? Master gave me his blessing to eat you, and I plan to do just that from now on." Kuro spoke as she rubbed her wriggling belly.
"noooooooooooooooo!"

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This was one of if not the first story I ever wrote. It doesn't hold up. But it's still fun.