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"Relax, Siggy! Osako-nee will be gentle!"
Still, Sigma gave her older sister a fearful look. It wasn't her fault. She was just a 4 year old little girl, and Osako couldn't help but find her miniature body so fascinating, having her nightgown lifted to reveal her immature flat chest. "Aww, these are so cute!" Osako pinched a nipple, earning a whine from the toddler's lips.
"Stopp," that didn't stop her, if anything, it encouraged Osako to keep toying with her toddler sister's chest. It was just soooo adorable to see how underdeveloped she was, having cute puffy pink nipples that she was now dragging her tongue over. "And they taste delicious too!" The 13 year old giggled.
Osako didn't exactly know where this infatuation with her little sister's chest came from, but she wasn't complaining as Sigma shuddered with every flick of her older half-sister's tongue on her nipple, feeling her saliva coat it. "Neechaaan..."
"Shhh, baby, don't worry," Osako continued to laugh at her as her hand disappeared between her thighs, brushing over her panties. "Aww, wet already? And you even wanted me to stop!" Sigma gave her big needy eyes, too little to comprehend what the hell Osako's problem was, just shivering from the contact of her teasing her strawberry printed panties before easing a digit into her toddler pussy.
"A-ah! Osako!"
The 13 year smirked as Sigma attempted to squirm free from her sister's grasp, causing her to wrap her arm around her and lower her head to graze her neck with her teeth. "Pleaseee... Mommy doesn't want you to touch me like this."
"And is mommy here with us right now?" Osako questioned, her fingers rolling across Sigma's pebbled tits. "I meann, do you really want her to see us like this? With your cunt soaked and dripping all over my finger?" She teased, continuing to bite her baby sister's neck while thrusting a finger in her, causing the toddler to whimper harder.
"Nooo- pleasee..."
"Please what, Siggy?" Osako asked with a wide grin, slipping a second finger into her chubby cunt. A gasp left Sigma as her fingers clutched the young teen's leg, tears beginning to stick to her lashes. "S-stopp it..."
"Aww, you know I'm only doing this because I love you, right?" Osako asked in a sweet voice, her thumb rolling over Sigma's clit, grinding her hips into her backside, adoring how her baby sister's toddler cunt was dripping all over the digits she was scissoring inside her. Sigma was just a precious lil' thing, with the squishiest and prettiest lil' pussy between her legs and the cutest nipples too.
"I- I love you too, Osako-nee... You're just mean," she cried, mumbling something in Polish.
Another smirk split Osako's lips, continuing to finger her while her free hand squeezed her tits, admiring just how fucking tiny she was. Sigma was the most beautiful girl in the world, and Osako couldn't control herself, licking her tears away.