Let's test some limits

I looked at my cum dripping down Amy's face. "So... anything, yeah?"

"Obviously," she said, with a "why are you asking super simple questions" expression. Even though I had cum barely a minute ago, my cock twitched.

"Could I..." my mind raced. How far could I go with this? "Could I breed you?"

She blinked. "Not for another couple of weeks, you can't." On the phone's screen, I saw Debbie raise her hand. "Um, I'm ovulating, if you want?" she said shyly. "I'm on the Pill," Jenny said apologetically. "Do you want me to stop?" I looked at the tall black girl and the short redhead, both of them naked and sweaty. My cock twitched again. "I... I might take you up on that, actually." They both beamed. "Thank you so much!" Debbie said.

"That's nice of you!" Amy commented. She hugged me.

"Can I finish myself off?" Debbie asked. "I'm still really horny."

I considered saying yes, but then had a better idea. "Does... does either of you eat pussy?"

Jenny shook her head. "Never."

Debbie shrugged. "I fantasize about it a lot? Honestly, I think I'm probably gay. Wow, I never admitted that before!" She slid her fingers into her wide open pussy, moaning, then rubbed her juices into her fat dark nipples and licked the left one.

"I have," Amy volunteered. "A few times. Well, okay, a whole lot." My eyes widened, and my cock stiffened.

"Uh," I said. They all stopped talking instantly, waiting for whatever I had to say. "Jenny, have you thought about eating pussy? Have you wanted to do it before today?"

Jenny looked thoughtful, then shook her head again. Debbie sighed. I went on. "But you'll do it if I tell you to, right?"

"Do you mean, will I eat pussy, or will I want to eat pussy?"

"Um, both?"

Jenny exhaled. "Okay, thank god. For a few seconds, I thought you wanted me to eat pussy but not love doing it!" She grabbed Debbie, kissed her passionately, then worked her way down and buried her face between the black girl's thighs. Debbie picked the phone off the bed and aimed its camera to give me a better view. Moments later, she was wailing and swearing as her orgasm finally hit. Jenny kept going, though. "Thank you, John," Debbie muttered over and over. "Thank you, thank you, oh god, lick my pussy, oh god yes yes yes, thank you so much John, thank you, thank you, oh god cumming again again again yes yes yes yes FUCK!"

"Mmmm," Amy said next to me, fingering herself with one hand and pulling her nipples with the other. "This is so fucking hot," she said, and kissed me on the cheek. On the screen before us, Jenny sat up, her face dripping and her hair wet. "You fucking squirted on me, bitch!" she laughed. Amy gasped, and I realized she had just had a second orgasm too. My cock was pulsing.

"So, John," Debbie said after she caught her breath, "are you gonna come over and breed me now? Because if not, I really should get back to my problem sets."

"Oh," Jenny said. "Sorry, no, they're 400 miles away."

Debbie shrugged. "How about I come up to see you at the holidays? Maybe you can breed me then?"

"Um. Maybe, if you're ovulating?"

"Let's hope!"

"Should I go off the Pill?" Jenny wanted to know. "Uh-uh," Amy said. "You're still fucking Jason, right? I don't think John would want you pregnant by someone else." She glanced at me. "Uh, would you?"

"I... I guess not," I said. "Wait - you'd dump Jason if I told you to, right? Never fuck him again?"

"Of course." Jenny looked sad for a moment. "Is that what you're telling me to do?"

"Um... no, not yet. But I do want you and Debbie to fuck each other regularly." Debbie gave me two thumbs up and a huge grin. "But... but not when you have Jason's cum in you," I continued. "Debbie, have you ever tasted a guy's cum?"

"Nope. I made out with two guys in freshman year, I let one feel me up, I gave him a handjob, but that's all. Yeah, pretty sure I'm a dyke. Only ever think about girls when I masturbate. I'm not interested in guys except you. Unless... unless you want me to be?"

"Uh... no. No, stay a dyke except for me."

"Will do."

"Okay, great," Jenny said. "John, it's wonderful that you're finally using us, but if you don't have any other instructions for us, Deb has her problem sets, and I've got a lab report I need to finish with. Plus we need to shower."

"Uh... no, that's okay."

She nodded. "Okay, great, talk to you next time."

"Wait - one more thing..."

"Yes?"

"Tell me your password. So I can read your email."

Both girls stared at me through the phone camera. "Don't be a creep, John," Jenny said, then ended the call.

Amy glowered at me, then hit me in the back of the head with her open palm. "What the fuck was that!" she exclaimed. "Why do you want to read her email! What's wrong with you!"

"I... I just wanted to know if I could!"

Her glower was a full-on glare. "John. We are here for your sexual free-use. Would reading Jenny's email make you hard? Help you cum?"

"Well... no?"

Amy looked down at my cock. I had gone limp the second she started yelling at me. She sighed, then sat down on the edge of the bed and patted a space next to her, indicating I should sit down. It was a little surreal, since she was still completely nude with my cum drying on her tits, but I did. She put an arm around me, in full Big Sister Giving Advice mode.

"John," she said, "You're my brother, and I love you, and I'm so happy I get to have you use me, and you cannot violate people's privacy like that, unless it's sexy. People will get mad at you! You could get in trouble!"

I took a deep breath. Apparently the world still worked the way it did before, with one minor difference. "Okay," I said. "Okay. You're right. I was wrong. I fucked up. I won't do that again."

She nodded decisively. "Good. Did you still want to try breeding me, or...?"

One HUGE difference.

"I, um, maybe? But... I do have a question for you first."

She smirked. "Is it rude and private?"

"Yep."

"Is it also sexy?"

I smirked back. "You said you've been eating a lot of pussy. Who is it? Anyone I know?"

She shrugged. "Mostly mom and Sabrina. And Aunt Zoe."

My eyes opened wide. Our older sister Sabrina was gorgeous, but our mom Emma was a walking wet dream. I'd never understood why Dad left.

Amy looked down at my rigid cock and snickered.

"I guess you wanna fuck mom first?"