"This is probably a bad idea…" Chihiro said to herself as she set up her camera. She had it set up on her TV stand, opposite from her bed as she sat on the edge of it. Her body felt shaky, and her palms sweaty, but she had already decided that this was what she was going to do, and she was going to stick to it.

She hadn't yet been able to tell her brother about her true gender and had been agonizing over how to do it. She loved him dearly, perhaps more than she probably should've.

Eventually, she'd come up with something…unconventional, to say the least. She knew he adored little sisters, meaning as soon as she revealed herself, he'd likely have quite an adoration for her almost immediately. So why not give him something amazing to start off their new relationship?

Some part of her knew this was wrong, that this was something a little sister should not be doing for her big brother, even if they weren't actually related by blood. Even so…

"H-Hello, Big Bro!" Chihiro said with an awkward wave. "I-I know this might seem weird when you get it, but…I had something I needed to tell you, and I thought it would be better if I just…showed you."

She took a deep breath, and grabbed the hem of her shirt, which was large and loose, often to help hide her feminine form, and lifted it up and off. A moment later, it was on the floor, and her bra was on full display. Her face red, Chihiro tried for a smile. "I-I'm actually a girl!" She allowed for a pause which she was sure her brother would need after such a reveal, and after a few seconds passed, she continued. "So…I know how much you like little sisters…and…I like you a lot, so…I wanted to give you something special."

Chihiro then stood up so she could remove her jeans next, and drop them to the floor. Then, as she was still standing, she blushed as she grabbed her panties. She twisted herself to the side and yanked them down, so he wouldn't be able to see the front yet, but he could see the curve of her butt. She placed her hands between her legs and quickly sat back down, closing her thighs together to keep that space hidden for now. She then grabbed the bottom of the sports bra and, placing one hand over her chest as she did it, pulled it up and off, leaving her completely nude before she ruffled her hair with one hand to get it neat again. Her face was burning red as she smiled at the camera.

"I-I really hope you like it!" she said before she finally dropped her arm. Her small breasts were revealed in all their glory. She squealed to herself at her own reveal, imagining her brother's face as he took them in. She knew she didn't have to worry about them being small, since he preferred any size when it came to little sisters. Her nipples were already growing a little hard, both from the chill of the room and the idea of what she was about to do.

Next, she placed her hands on her knees, noticing that they were shaking. With a deep breath, she slowly spread her legs, opening them up to the camera's, and by extension, her brother's gaze. Her blush grew deeper with every inch she shuffled until she was shuddering by the time her legs had fully opened. She was completely shaved, something she had noticed her brother preferred for his characters. Her body was shaking intensely now, mostly from embarrassment. At the same time, however, while part of her brain was telling her to stop, the other part was telling her how happy her brother would be with this.

So she kept going.

One hand slid between her legs as the other found its way to her chest. As she grasped her small breast, she started rubbing her lower lips, which were already a bit damp. She groaned at her touch, her toes curling a bit as she rubbed up and down the wet slit, feeling it growing wetter in response to her touch. She didn't masturbate very often, so she was surprised at how soft her chest felt, despite its size.

Soft moans left her lips as she continued fingering herself, almost forgetting in her haze that she was recording herself. She slipped a finger inside herself, and her head reared back as a louder moan escaped her. She was thankful her parents were out so there wasn't a chance of being caught, but even so, her volume left her feeling more embarrassed.

She gently thrusted the finger in and out of herself, the wet sounds of it filling the room and her ears. She massaged her breast, making sure to briefly rub her thumb over her nipple, which further stimulated her. Thanks to how wet she was, the finger easily slid in and out.

She continued imagining her brother, his face upon seeing such a lewd sight in front of him, how he would instantly get hard, reach into his pants, and take out his-

"Ahhhhh, B-Big Bro~!" she cried out as she slipped a second finger inside, her body shaking like she was in an earthquake. She sped up her thrusts, moving in and out faster and faster. She could feel the pressure building up inside her, already threatening to burst. She figured her inexperience wasn't helping here. If she knew how to edge properly…

So she decided to end it with a bang. She firmly grasped her nipple between her fingers and twisted it at the same moment she plunged three fingers inside her pussy. She gasped, her head shooting back as she came. It was explosive, spraying her juices on her hands with fervor as she rode out her climax in waves. After what felt like minutes, she was finally beginning to settle as she stopped leaking. She panted as she removed her fingers, now covered in her fluids. She took several moments to catch her breath before she looked into the camera, and gave a small smile.

"I-I love you, Big Bro~!"

With that, she quickly cleaned up both herself and her hand before stopping the video. She sighed as she looked down at her phone, and then opened up the text messages. She added the video to a text to her brother that was simply a heart emoji, and after a deep breath, hit send.

With that, she was ready to take a shower, and as she walked to the bathroom and smiled to herself, she couldn't help but feel a mixture of excitement and anxiousness at how her brother would react.