Lily was the one who planned to seduce Rachel a few weeks later. Only it turned out to not require much effort on her part.
It started with lingerie. April took Lily lingerie shopping one day while she was supposed to be out doing a service project. My sister showed me what she bought when she came back: in addition to a variety of panties, she bought a see-through blue bra, a tight black lace halter dress that hugged her body, a babydoll pink silk negligee, and a strapless bustier that made her tits look like ripe peaches. She modeled them all for me and then fucked me like a banshee. One of her new pair of panties were stained with both our cum by the time we finished.
"I wonder what Rachel will think when she sees this stuff," Lily said, her fingers idly tracing circles around one nipple while her other hand lifted the rumpled halter dress off the bed.
"She'll freak," I answered.
Lily giggled. "Maybe, but not as much as when she finds the dildo April bought me."
She sat up. "Oooh! That's not a bad idea. Maybe I SHOULD let her find this stuff. See how she reacts."
It was a good plan to test the waters, but in the end, Rachel got a lot more than just a shock.
She told me about it herself four days later. Lily and my mother had gone out of town, and my Father was at the church, so Rachel took the opportunity to show up in my room completely naked, her fresh shaved pussy dripping as she told me what had happened between her and Lily. When she walked in, her tits thrust out proudly, I wanted to throw her on the bed and fuck her right there. Rachel approaching ME was not what I had expected.
So I told her to stand still. She looked at me expectantly, a sigh escaping her lips as I pulled my shirt off over my head.
"What are you doing, little sis?" I asked, my fingers slowly undoing the button and zipper on my pants. "Why are you naked?"
I dropped my pants down when she said, "Lily told me. About you and her. I don't want to be left out."
I waited patiently, my fingers playing in the waistband of my boxers. I didn't drop them, not until she started to answer my next question. "Start from the beginning. Just what do you think you're being left out of?"
She let out a little moan when my movement flashed my pubic hair, my hip bones, the top of my dick. She started talking.
"I had no idea what you guys have been up to. Lily stayed home from our youth group and said she wasn't feeling well and wanted to go to bed early. I felt bad for her, so I brought her back a Sprite from the youth meeting and went up to her bedroom. We haven't had to share rooms since we were little, but we've never knocked before. So I didn't. I just walked in."
She blushed, but her eyes were riveted on my hand, which had begun stroking my cock up and down slowly. I stopped moving when she stopped talking.
"And?"
"And she was lying on her bed in her negligee, her legs spread open, playing with herself."
I stopped my hand again. "Rachel, you have to tell me all of it if you want what I think you want. No being dainty, that's rule number one for me, and for Lily, and for you too. I want to hear you say all the naughty words we aren't supposed to."
Rachel didn't hesitate this time, and I watched one hand start to slide across her leg and to the V between her legs. "She was fingering herself," she said. "Fingerfucking her pussy and moaning."
"Good girl. Your sister sure does like things shoved up her cunt," I smiled.
"Yeah, I've noticed that. I do too."
That was an unexpected answer. Maybe Rachel was more advanced than Lily. Hell, that was more than anything I would have even thought at her age. This was going to be even better than I thought.
"So what did you do?" I asked.
"I gasped and shut the door again."
"But you didn't leave, did you." It wasn't a question. In fact, I'd heard this story before. Lily had already told me what happened, but making Rachel tell it too just doubled my pleasure. And I wanted to see how well Lily had done loosening her twin up (not that Rachel seemed to need much prodding).
"No. I didn't leave. I stood outside the door and thought how good it felt when the shower spray hit my pussy. Sometimes I used to hold the handheld showerhead against my cunt. That's the first thing that ever made me cum. Did you know that?"
"No," I whispered. God, my sister was sexy. And brash. And apparently had been suffering under a burden of horniness for a while.
"I don't think Lily did either. I was always a little more free-spirited than she was." I gulped. Lily was the repressed sister? That little fuckwhore who sucked me off daily since our initial coupling and loved pulling my cum out of her pussy with her fingers so she could eat it? She was the tame one?
"So what did you do?"
"I opened the door again. Lily hadn't stopped. I don't know if she saw me the first time or not, but I slid inside the room and shut the door behind me. I watched her for a few minutes, and then she opened her eyes and saw me. She still didn't stop. She said, 'Sissy, I've got something to teach you.' And then she pulled her fingers out of her pussy and sucked on them."
"Ooh," I said, my hand stroking my cock again. "That little girl loves fuckjuice."
Rachel smiled, and now her fingers were rubbing circles on her clit. "I know she does. I do too."
"Keep going," I said. "But stop touching yourself until I tell you you can."
