After Christmas, some things started to change for us. Kat was visiting at times, and staying the night, and Krysta and I began to plan New Year. We'd decided to celebrate it privately at my place.
A few days before New Year's Day, it began like most others; Krysta and I woke up, got in a morning quickie before she had to get ready for work, and I made our breakfast just in time for her to leave. But something happened that evening which shook us to the core; our mom texted me.
'I still think it's nice you two are getting along so well, and spending time together,' the text read. Then another came. 'I want you both to know I love you, and that will never change no matter what. You two have fun, will talk to you soon.'
I looked at Krysta, "I think mom knows."
"Yeah," Krysta replied. "I'd better go talk to her tomorrow, and see what she says. But since we can't do anything about it today, we might as well just do what we normally do."
She kissed me, and started undoing my pants. I stopped her for a moment.
"Wait, I got pizza on the way," I said.
"Good, I'm hungry, but I need your dick," Krysta said as she kept undoing my pants. "Besides, I know I can make you cum before the delivery guy gets here."
After she managed to take off my pants, she took off her shirt, and bra while I took off her skirt. Both of us naked, I guided her to the couch as we made out. She put a cushion under her hips, and I slid my cock inside her. She moaned loudly, and we started fucking like we hadn't fucked in a month. We weren't gentle with the act, but we weren't overtly rough either. There was a perfect mix of lust, and the idea that we'd have to stop to pay for the pizza I ordered, and wonder if the delivery person would know us, and wonder why the fuck it took us so long to answer the door.
The popping noise made from my hips pounding into her took me back to some of our antics during last summer, after we'd confessed to each other. With her legs wrapped around me, I repeatedly penetrated her with ease. A fire in my soul burned hot, and I could feel Krysta's juices leaking around my cock.
She whimpered, and gasped with each thrust, while moaning my name under her breath. I kissed her lips tenderly, and she wrapped her arms around my neck. Our motions picked up, and I could feel that familiar feeling in the pit of my stomach; butterflies telling me that this was the ultimate act, and that I should keep going. I did, and I knew I wouldn't stop until I came inside her.
I felt her pussy grip my shaft as she moaned and trembled under me. With a knock on the door, I felt myself starting to cum inside her, feeling a kind of thrill that the person knocking had no idea that I was trying to impregnate my own sister behind the door they had just knocked on.
After I stopped cumming, we both got dressed quickly, as if we'd just been caught by our parents, and were scattering to make it seem like all was normal. It was a rush, though not for the right reasons, and as Krysta shot out of sight, I opened the door to the delivery man with our pizza.
"That'll be twenty-two fifty," he said. I gave the man thirty, and sent him on his way, then closed the door.
"That was close," Krysta giggled as she came back into the living room.
I sat the pizza box on the counter, and got out two paper plates, when Krysta's phone rang.
"Watch, that'll be mom, and she'll make a passing comment about condoms that are on sale, and how we should totally buy them," I joked.
Krysta laughed as she answered her phone. "Hello?" There was a pause. "Um, hang on I'll ask."
"Is it mom?" I said. "I was just joking, that'd be weird."
"No, it's Kat. She wants to know if she can come stay a couple days and hang out with us."
I paused a moment, trying to read Krysta's expression, but she had none.
"Um, yeah that's fine with me, unless you want us to be alone. It's not like she doesn't already know we're fucking or something, so we could just sneak off to the bedroom if we have to."
Krysta spoke into the phone again. "He says that's fine, come on over... yeah... no seriously, it's fine... I mean you already know what we're doing, so it's not a big deal... yeah... see you when you get here... bye."
"We'll save some pizza for her," I said.
After we both ate, Kat finally arrived. I let her in, then locked the door. Less than a minute after she put her bag down, she'd already started stripping her clothes off. With her phone in hand, she laid on the couch, naked, doing things on her phone.
"Don't mind me," Kat said. "I'll usually be on my phone when I'm here, probably. Ayden and I sext a lot when I'm not home, so that's one of the things I'll be doing with it."
"That's cool," I said.
"Also, when I masturbate, I tend to leak a lot," Kat said.
"That's normal, isn't it?" I said.
"No, I mean... a LOT. I will soak this fucking couch cushion in less than a half hour, if I'm horny enough, and if I squirt, then that's even more that will soak it. Okay, so maybe not a half hour, but you get my point."
"Don't worry about it," I said. "We saved you some pizza, in case you want some."
"Sweet," Kat said.
Krysta and I got undressed as well, and she sat on my lap, pulling my cock back inside her wet pussy. She liked this position when we chatted online about our relationship, and anytime she was in this spot, she would ride my cock in circles, so I felt her tight cunt gripping my hard cock.
"How often do you and Ayden fuck?" Krysta asked.
"About every day," Kat said. "Sometimes a few times in a day, sometimes only once a week. What about you two?"
"Oh god, we're fucking constantly," Krysta said.
"Even right now," I added. "She's got me inside her, and she's riding me."