Yamada decided to possess Emma and masturbate

Emma won the votes!!

....

My twin sister Emma was the one I kept coming back to.

It wasn’t that I wanted her body more than the others—or maybe it was, maybe it was exactly that. She was the first, the one who’d unlocked whatever this was. And her body was incredible. Tall, athletic, with curves. Her tits were the kind of full, heavy ones that bounced when she ran, her ass tight from years, her face sharp and beautiful, with our mother’s grey eyes.

I tried to stay away from her. The first time had been an accident, and I told myself that was the line I wouldn’t cross again. But I couldn't help myself. I have to masturbate in her body.

One Friday night, I was visiting my parents’ house. Emma was home for the weekend too. I waited until everyone was asleep, then locked myself in the guest bathroom and pulled up a video of two women going down on each other. I came into a wad of toilet paper with a low groan. The static went again.

I slipped out into the hallway, naked from the waist down and paused outside Emma’s door. It was cracked open, just enough to see the soft glow of her bedside lamp. She was reading propped against her pillows in a thin camisole and cotton shorts. Her long brown hair was loose around her shoulders, and she was biting her lower lip absently.

I opened the door a little wider. She looked up.

“Yamada? What the hell, put some pants on.”

I stepped inside and touched her hand.

Everything went black. I got used to it.

I was inside Emma, in her bed, the book still open in my—her lap. I could feel her body immediately, the familiar weight and warmth of it. I closed the book and set it aside, then got up and locked the door.

In the mirror, she looked back at me. She was so beautiful it hurt.

“This is wrong,” I whispered in her voice. But my—her hands were already moving, cupping her tits through the thin fabric and feeling her nipples harden under the touch. “It’s so wrong, but I don’t care. I don’t fucking care. I'm going to masturbate hehe.”

I pulled the camisole over her head and let it fall to the floor. Her tits were heavy and full, the nipples dark pink and already hard. I squeezed them, rolled them, pinched them until a jolt of pleasure shot down to her pussy and made her gasp.

“Oh god,” I moaned in her voice. It was Emma’s voice, lower than Ally’s, catchier. “Why does this feel so good? Why do you feel so good?”

I imagined her angry. The fantasy burned through me, hot and vivid. I slid my hand down her stomach and into her shorts. She was already soaking and the wetness coating her fingers as soon as I touched her.

“I’m so wet,” I whispered. “Is this from me? Is your pussy this wet because I’m inside you? Do you always think of me when you masturbate?”

I rubbed her clit in slow, hard circles and the world narrowed to just that point of pleasure, just the building wave inside her. I pushed two fingers inside and curled them the way I’d learned, the way that made Ally and Riley scream, and Emma’s hips bucked hard against her hand.

“Yes,” I chanted in her voice, rising. “Yes, yes, yes, oh my god, I’m your sister and I’m touching myself because you’re inside me and I can’t stop, I don’t want to stop, I want to cum, I want to cum for you, Yamada, I want to cum for you—!”

The orgasm hit her like a truck. She came so hard that her vision went white and her legs locked and a scream tore out of her throat that would have woken the whole house if her door hadn’t been closed. I rode it with her, every second, every spasm, feeling her pussy clamp down around her fingers and her thighs shake.

When I finally pulled out of her, I was back in my own body, kneeling on the floor beside her bed. My cock was painfully hard, leaking onto the floor. Emma was lying on the bed, her tits bare, her shorts shoved down around one ankle, her fingers still pressed between her legs.

The thing is that I didn't manage to clean her up, the orgasm was so strong that it pushed me out from her body.

“What…” she started, then looked at me and frowned. “Why am I naked? Do you strip me off you pervert?!”

“No I don't, you're the one with the fingers inside your pussy. Not to mention you were talking in your sleep,” I said, my voice rough. “I came to check on you. You, uh, you took your clothes off.”

"Get out ugh.."She stared at me for a long second. “I had the weirdest dream. You were in it, and you were… no, never mind.” She pulled the blanket up over her chest. “Go to bed, loser. This is the last time you're seeing me naked.”

"Okay okay." I lied.

...

Hi, it's the author here!! The next chapter will be about Riley.

I can write your ideas from message on DM or in the comments section, so please let me know what you want me to write for chapters!!