She leans against the doorframe, her hips swaying slightly as she teases you with the thought of what might come next. "I think," she says, running a hand through her hair, "that I'm going to have to help you out with that." Her eyes meet yours and there's a predatory gleam in them that sends shivers down your spine.

"Why don't you come here, little brother?" She purrs, taking a step closer. "I think it's time for some more... instruction."

You feel a thrill of anticipation course through your body as she beckons you closer. Stepping out of the doorway, you approach her slowly, unable to resist the allure of her dominance and feminine power. Her scent fills your nostrils, intoxicating and addictive at once.

When you're close enough, she reaches out and takes your chin in her hand, tilting your head up so that you're looking her in the eye. "Do you understand what I expect from you now?" She asks softly.

Oh, you're so tight... I should have known that someone as perverted as you would have spent hours practicing on your own toy. You feel incredible wrapped around my finger like this...

I slide my other hand down between our bodies and begin stroking your cock in time with my finger fucking you. "That's it, little brother," I whisper, watching the pleasure wash over your face as I take control of your body. "Just let go and enjoy what I'm giving you...

My fingers dig deeper into your ass as I begin to thrust faster and harder, feeling you growing hotter and more desperate beneath me. It's almost too much for me to bear... The feel of you clenching around my finger, the wet heat of your hole tightening around my hand... I can tell that soon enough, there won't be any holding back.

I pinch your nipple hard, eliciting a sharp gasp from you as you arch your back off the bed in pleasure. "That's it,"

Her breath comes in ragged gasps as she tries to catch it, her chest rising and falling rapidly beneath your fingers. "Mmm... that was incredible," she pants, the words barely audible between their lips as they kiss again. Her tongue darts out to tease yours, dueling for dominance before retreating back into her mouth to meet yours once more.

Her hips rock lazily against your ass, her cock still hard and impossibly full inside you. "You feel so good,"

"Oh sis..." I moan into her mouth as she moves against my ass. It feels so good to have her inside me like this... So full and warm. I arch my back up into the contact, desperate for more of her touch.

Her fingers trail down your stomach, over your hip before slipping between your legs, rubbing at your swollen cock. "You're so hard," she whispers against your lips before taking you into her hand, slowly stroking up and down the length of you.

"I just helped you become the little brother you were always meant to be," she says innocently, running her fingers through your hair again. "Now that our bodies are so intertwined... well, it only seems right for us to stay this way." She leans in close and whispers in your ear, her hot breath sending shivers down your spine, "Besides, I have plenty more plans for you."

Her hand moves lower, cupping your heavy balls through the fabric of your pajamas. "And these,"

she continues, squeezing gently, "will always belong to me now." She begins to stroke your cock again, her touch both familiar and terrifyingly possessive. "So you'd better get used to it."

Her fingers move faster, matching the rhythm of her words as she murmurs dirty little promises into your ear, leaving you panting and aching for more.

As she climbs back into bed, Nezumi leans over and pins you down with one hand, grinning wickedly as she holds the syringe up to your eye. "This is just a little bit of my cum that I've harvested from one of my recent orgasms," she explains in a low, sensual voice. "I've added some sterile water to it so that it won't hurt you too much when I inject it into your balls."

"I'm going to let you sleep for a while, and then I'll come over and check on you. You should be asleep by 10 PM, and I hope it will take me at least an hour before I wake you up again."

She leans forward, her hard cock pressing against your tiny one as she watches the two shafts slide together. "See? That's what a real cock feels like." She grinds against you harder, moaning softly as pleasure washes over her. "You're so tight... So perfect..." Her free hand reaches down to fondle your tiny balls, rolling them roughly between her fingers. "And soon I'm going to fill this tight little hole with my cum."

"Ha! You think my cum would even fit in that tiny thing? Don't flatter yourself. But I do like the idea of claiming your balls as my own..."