Damn that was hot, I thought to myself. And this whole situation is insane. Both girls were worried about the other wanting more from their relationship. Both insisted they weren’t into girls, yet both wanted to keep their relationship with each other. This was so odd, and hot all at the same time. I didn’t think my cock was ever going to go soft.
I laid back on the bed and stared at the ceiling for a while, thoughts and images of Karina and Carly, both naked and dancing around my head. I pulled my shirt off first, then reached into my shorts and pulled my dick out. There was no way I was getting any work done right now. I laid on my back, stroking myself and thinking about my sister’s smooth pussy lips, Karina’s perfect pink nipples, and wishing desperately I could see them together.
Soon enough I was shooting blobs of cum into the air that splattered on my chest as they landed. Well, that didn’t take long. I stood up and looked for something to clean up with. Seeing nothing, I tucked my cock back in my shorts and knocked on the bathroom door twice. “Coming in,” I said out loud and knocked twice more.
I opened the door and was mesmerized. Once again, Karina was sitting on the counter by the sink, head thrown back against the mirror, her eyes screwed shut, earbuds in. She was once again nearly naked, this time just a tiny pair of yellow bikini bottoms adorning her body. Her beautiful tits jutted out proudly at me. She had both hands in her panties and was clearly finger-fucking herself and rubbing her clit at the same time. She pulled the fingers from her wet pussy and sucked them into her mouth.
I gasped involuntarily. Her eyes opened and bulged out of their sockets. “Sorry,” I mumbled, and I turned around and looked away
“Ohmygodohmygodohmygodohmygod!” she muttered out loud as she scrambled back into her room.
Wow. My dick was already hardening again as I cleaned myself up. I had seen her masturbating twice now and the sight was awe-inspiring. How was I ever going to get any work done with her and Carly around me?
I stayed in my room for a while. I wandered back to the living room when Mom and Dad came home. Mom had her hands full of shopping bags and Dad sent me to get all the luggage from the car. As I came back into the house, Karina was standing there talking to Mom. Her eyes caught mine and widened questioningly. I gave her a quick nod and went about my business taking suitcases to my parent’s room
Karina talked with my parents for a while before they went to bed. They both had to work in the morning, whereas school didn’t start for us for another couple of days.
I went back to my room. I was getting close to finishing the project I was on, and I needed to push through. I worked for a few more hours. Finally, just after midnight, I was done. I hit submit and sat back in my desk chair, very satisfied.
I heard the front door open. Carly was home from her date. I thought about going to greet her but then I thought more about it. Karina needed to talk to her, I’d only get in the way. Although …
I remembered the way Karina came home the other night and went right into Carly’s lap, talking about how horny she was and how wet her pussy was. Did Carly come home just now in the same mood? And then my mind flashed back to seeing Carly in the bathroom this morning, peeling her panties down and showing me her smooth pussy lips. I remembered how she ran her fingers over them idly. Dammit, I was hard again.
I had to stop this. I stood and stretched, then my bladder spoke up and I went over and knocked on the bathroom door. I heard the toilet flush and then Carly called out, “Come in.”
I opened the door and walked in.
“Hey brother. You’re up late again.” She stood there at the sink in the exact same outfit Karina had worn the night before. Tight black skirt, yellow tube top, which featured her breasts as prominently as it had Karina’s. She looked good. Really good.
“Finished a project for work. You have a good time tonight?” I asked.
“Oh yes. We saw that new Marvel film. It was really fun.”
“That’s cool.” I said, trying not to stare at her tits.
She turned and faced me. Without warning she reached out and gave me a big hug, pressing her breasts into my chest. “Yep, you definitely like this outfit,” she giggled, feeling my dick pressing into her leg.
I pulled away. She smiled and put her hands on her hips. I lost the battle with my cock as he got fully hard and threatened to rip through my shorts.
“You do look really nice, sis,” I said as I headed over to the toilet and lifted the lid.
“Thanks.” She leaned back against the sink. I stood there for a moment, hesitating. I expected her to leave. “Don’t mind me,” she grinned. “Carry on.”
I pulled out my hard cock and held it. This was going to take some serious maneuvering to not make a mess all over the place.
“I always wondered how guys pissed with a boner,” she quipped, sensing my struggle.
“It’s not easy.” I admitted. “Usually, it’s better to wait for it to go down some.
“Ok. How long does that take?” she asked.
“Well, with you standing there staring at me, dressed like that, I don’t know if it will on its own,” I confessed.
She giggled. “So, what do you do next?”
I wasn’t sure what to do. I really needed to piss, but there was no calming down my cock. I could see Carly’s nipples through her blouse. She shifted her weight, causing her thighs to slide against each other noticeably. I was certain she was as turned on as I was.
Without really thinking, I stepped into the shower stall. I took a couple of slow, deep breaths and tried to relax. My cock, still pointing straight out, let loose a stream across the stall and splashed against the tile on the opposite wall. I heard Carly giggling. I finished, shook the final drops off and turned the shower head on for a few seconds, long enough to let the water rinse the evidence down the drain. I stepped out and stood in front of my sister with my cock still hanging out of my shorts.
“That was so cool. How often do you do that?” she exclaimed.
“Piss in the shower stall? Never really had to before tonight,” I said, truthfully.
“It went down some,” she said, staring at my now half-erect cock, still hanging out in the open.
“Yeah, sorry, that happens after I pee,” I apologized, though I wasn’t sure why.
“That’s alright,” she said, still staring at my dick. “I like watching dicks get hard.”
“Keep talking like that and I will get hard again soon,” I said, feeling it start to throb.