I watched as Tiffany strolled over to the pool, naked, and slid in next to me and Shelia. She leaned down and took her sister's hard nipple into her mouth, slowly running her tongue over Shelia's large, dark areola.
"God, I love sucking your tits sis," Tiffany said, rolling Shelia's nipples around in her fingers, "They're so fucking big."
"Can you still taste daddy's cum on them??" Shelia asked, smirking at me, "He came all over them a little while ago."
"That's pretty fucking hot," Tiffany replied, "Why didn't you cum on my tits daddy??" she asked, mockingly.
"Well, I did cum in your panties," I offered.
"Maybe we should give him a good show sis," Tiffany said, turning back to face Shelia, "What do you think??"
"I like that," Shelia replied, "What do you have in mind??"
I watched as Tiffany took Shelia by the hand and led her out of the pool and back up on the deck. I was mesmerized watching my two step daughters hot little asses sway as they sauntered over to the loungers. Tiffany had Shelia sit down in the lounge chair, then she leaned the backrest down so Shelia was lying flat, and stood over her, staring at me.
"Make sure you're watching daddy," she said, rubbing her pussy seductively.
Tiffany straddled Shelia's face, lowering her pussy down to her mouth, as she leaned forward and began lapping at her sisters' pussy. My cock was instantly hard again, watching my step daughters 69 each other right here in front of me and I instinctively started stroking myself. I watched intently as Tiffany probed her tongue in and out of her sister's sopping wet pussy, sucking at her folds as she thrust her own pussy down onto her sister's face, both girls moaning in pleasure.
"Use your fingers sis," Tiffany moaned, as she continued licking and fingering Shelia's pussy, "I want you to make me cum, make me cum for daddy."
Both girls were panting heavily, totally enthralled in lust, edging each other toward climax as I watched, stroking my cock furiously. I heard Tiffany cry out as her body started to spasm, her orgasm washing over her as she started to cum.
"Fuck sis," she moaned, "I'm cumming, fuck, fuck, ahhhhhhhhhhhh."
As she came she thrust her fingers and tongue back into Shelia's sopping vagina, flicking at her clit, causing Shelia's hips to start bucking wildly, her orgasm rapidly approaching.
"Ahhhhhhhhhhhhh, fuuuuuucccccckkkkkk," I heard Shelia cry out, as her orgasm rocked through her body, her juices covering her sister's face as she came, both girls still bucking their hips, enjoying every moment.
I could feel my own orgasm approaching as I walked over to my step daughters, both panting, trying to catch their breath. Shelia sat up and began kissing Tiffany, licking her own juices from her sister's face, as they groped each other's breasts.
"You girls are gonna make daddy cum," I said, my cock about to erupt, "Tell daddy where you want it."
Tiffany broke the kiss with her sister and took my balls into her mouth, sucking them gently and flicking at them with her tongue. Shelia began licking along my shaft, tasting the juices she left behind from our fucking earlier, pushing me over the edge.
"Fuuuuuucccccccccckkkkkkkkkk!!" I cried out as I unloaded, my cock bursting in my hand. Both girls sat back up and opened their mouths, like baby birds being fed by their mother, as my cock started spewing my seed, rope after rope, into their waiting mouths and onto their tits. I painted their chests with my sperm, covering them both, as my balls deflated and my orgasm subsided, before collapsing back into the chair behind me.
"Fuck, that was hot daddy," Shelia said, licking my load from her lips.
"You girls put on quite a show," I replied, my cock still stirring as I sat with my two naked step daughters, covered in my cum, "Now come on, we need to get back inside before your mother gets home and catches us."
"Ok daddy," both girls replied, grabbing their swimsuits and heading back inside. "But next time, you have to fuck us both," Tiffany said, matter of factly, as she pulled her top back on.
"Sounds good to me!!" I replied, hardly believing my luck.
The three of us went into the house, me upstairs to shower and change, and the two girls into Tiffany's room to do the same, just as Sally's car pulled into the driveway. Whew, I thought to myself, that was really close.
"Hey baby," I said, walking back down into the kitchen, still pulling my T-shirt on, "How was your day??"
"Long," she replied, "I'm exhausted. What are the girls up to??"
"Nothing much," I replied, nonchalantly, "Just hanging out by the pool. Do you want me to grill some burgers for dinner??"
"That sounds good," Sally replied, "I assume you two will be joining us??" she asked the girls as they walked into the kitchen.
"Sure," they replied, quizzical looks on both of their faces as they turned to look at me.
"For burgers," I said, taking the buns from the pantry, "Are you girls hungry??"
"Oh, OK," Tiffany said, "I could eat."
I walked outside and cranked up the BBQ pit as Sally sat and chit chatted with the girls inside. I began replaying the events of the last few days in my mind, images of my naked step daughters flashing in and out. I had masturbated for both of them, fucked both of them, watched them 69 each other, and then Tiffany basically told me there would be a threesome at some point. What the fuck am I doing?? On one hand it was really fucking hot, getting to fuck two young, hot girls; on the other hand, they were my step daughters and I loved their mother very much. To say I was conflicted would be an understatement.
"Hey, you awake??" Sally yelled at me, snapping me from my daze, "We're starving in here."
"Yep, sorry babe," I replied, "Almost done." I took the burgers off the pit and headed inside.
We all sat together and ate dinner, chatting and laughing. This was what I missed most, having both girls and Sally all home at the same time, just being together as a family, enjoying each other's company. This was the part that conflicted me so, if Sally ever found out about what was going on, not only would it ruin our relationship, but also her relationship with the girls. I didn't know what to do. Should I tell her?? Should I sit down and talk with Shelia and Tiffany and put a stop to this?? Fuck!! What to do??
After supper, we all went into the living room to watch TV; Sally sat in the recliner and I sat on the couch with the girls, Tiffany in between Shelia and I, the two girls sharing a blanket. Within 10 minutes, Sally was passed out, snoring loudly, exhausted from the long hours she was putting in at work. Suddenly I felt Tiffany's hand on my cock, stroking me through the thin material of my shorts, my dick hardening against her touch.
"What are you doing??" I yell-whispered, moving her hand from my groin, "Are you crazy, your mom is right there."
With that devilish smirk of hers, she slowly lifted the blanket up from her waist, revealing her hand rubbing against Shelia's pussy. She snaked a finger inside the leg of Shelia's shorts, presumably continuing to massage her sister's pussy, as she smiled at me.
"You should feel how wet Shelia is," she said, before sticking her hand down the front of her own shorts, "and me too daddy."
She took her hand from her sister's shorts and brought it up to my face, giving me whiff of Shelia's scent, before sticking her fingers into my mouth, feeding her sister's juices to me. Next, she did the same with her other hand, giving me a taste of her own pussy, before resuming rubbing my erection.
"We're so horny daddy," she purred, "We want you to fuck us. We masturbated each other in the shower earlier, getting each other off thinking of your cock."
Oh fuck!! That was really hot!! The thought of Tiffany and Shelia in the shower together, masturbating, was almost too much for me. I could feel the pre-cum forming on my dick as Tiffany snuck her hand past the waistband of my shorts and grabbed my rock-hard cock.
"Ohhhhhh," she said, smiling, "Looks like somebody is ready for a good time."
