Nicole came out of her room just as I sat down to have lunch in the lounge.
I'd stripped Mum and Dad's bed. Our morning activities made a nice mess of that, so it took priority. We couldn't have them sleeping in a bed covered in their son and daughter's cum.
Their bedding was already hanging on the line, and I had remade the bed with a fresh set. The clean laundry had been folded and placed on the owner's bed, and I'd done the dishes.
Nicole had her uniform on. It was the usual one today, but she'd left the top few buttons undone for my viewing pleasure. She would be dressed appropriately when Amy's mum came to pick her up.
She sat beside me, grabbed my hand, and placed it on her leg. I moved my hand up her thigh and under her skirt.
"No underwear today?" I asked as soon as I felt her bare pussy.
"Just while you have lunch," she replied, pulling a pair of light pink underwear from her pocket. "If I could get away with it at school, I would. If I got caught, I'd be in so much trouble with the principal."
"I imagine Mum and Dad might have something to say about it as well", I said.
I leaned over and kissed her.
"It's certainly been an interesting couple of days, huh?" I said, thinking back over the last three days.
Three days? Sunday afternoon and evening, Monday night, and Tuesday morning. Is that all it's been? So much had happened in such a short space of time.
"I've got no complaints about any of it", Nicole replied, rubbing my cock through my jeans as I fingered her pussy.
We saw a car pull up in the drive and, a second later, a quick beep beep of the horn.
"Oh dear, that's Amy's mum to pick me up," she said as she removed my hand from her pussy and stood up. She put her pink panties on, did up the buttons on her shirt correctly, and leaned down to kiss me on the lips.
"I'll see you in a few hours," Nicole said as she picked up her schoolbag and headed out the door.
I spent the remaining time doing the rest of my chores. I did the dishes and mopped the kitchen. As I vacuumed the lounge room, I saw Dad's car pull up in the driveway.
Ten minutes earlier, and he would have caught me fingering my sister.
"Hey," I said as he entered the hallway.
Dad looked exhausted. He'd already completed his regular shift. Not long after he arrived home, he received a phone call from work asking him to return to fix a problem.
"Hey," he replied, pouring himself a glass of Pepsi, downing it quickly, and then pouring another glass, which he took into the lounge room.
He slumped on the sofa and put his feet on the coffee table.
"Did you get the problem sorted out?" I asked.
"Yeah. It wasn't as bad as they'd made it out to be, but it still took some time to work through," he said.
"Were they nice enough to give you tonight off?" I asked
"Nope. I'm still working tonight. I should have a few days off after that."
Dad worked hard and often took on extra shifts when needed. They usually gave him time off instead, but they obviously couldn't do that tonight.
He finished his drink, put his glass in the sink and turned to me.
"Time for bed. Tell your mother I'll be up again later tonight, but probably not for dinner. I'll get up a little earlier, around 10:30 and have something before I leave for work."
"Okay, no worries", I replied, and he shuffled, exhausted, off to bed.
***
After Dad went to bed, I continued with my chores. I had already completed a load of laundry, mopped, vacuumed, and tidied the lounge room. I was folding the last clean laundry as Nicole walked through the door.
"Dad's home is he?" she asked.
"Yeah, he went to bed about an hour ago," I replied
"Well, looks like you're almost done. So what do you say we take a little... break?" she said with a mischievous glint in her eye.
I couldn't help but let my gaze wander over her body, taking in the way her skirt had ridden up slightly to reveal her smooth, tanned thighs.
"I could use one," I replied, trying to sound nonchalant as my heart began to race.
"But we have to be quick. Mum's going to be home soon and Dad's asleep in the next room"
"I promise to be quiet if you are," she said as she took my hand and led me to her bedroom.
As she turned, I noticed that the back of her skirt was riding higher than the tops of her thighs.
"No panties again?" I grinned.
She pushed me onto her bed.
"Thought I'd surprise you", she said, she said as she leaned down, unzipped my jeans, and took out my cock. She stood before me and pushed me back so I rested on my elbows. She wrapped her hand around my hard-on, pulling it gently to get me hard. She pulled up her skirt over her waist, moved forward, and straddled me.
"Umm, aren't we forgetting something? Shouldn't I be wearing some protection?" I asked.
She lowered herself down onto my cock and slowly began to grind against me.
"Oops", she said cheekily, "Too late, you're already in."
The feel of her smooth, slick pussy sliding against my cock was a sensation I had never experienced before.
Dad was snoring a couple of rooms away, and Mum would be home any minute now.
I closed my eyes, blocking everything out to concentrate solely on holding out as long as possible.
I reached up and cupped her breasts in my hands.
"You been thinking about filling your little sister's pussy with cum all morning, haven't you?" Nicole whispered in my ear.
"Uh-huh", I whimpered as I felt my orgasm building.
We were so caught up in each other that we didn't hear the sound of Mum's car pulling into the driveway or the sound of the garage door opening.
It wasn't until we heard the front door close that we snapped back to reality. Nicole's eyes went wide with panic.
"Well, you'd better hurry because Mum's already home," Nicole announced.
I gave another couple of thrusts, before finally I released my cum in Nicole's pussy.
"That felt amazing", she whispered as she rolled off me, stood up, pulled her skirt back down, and sat in my computer chair, tidying her hair. I quickly pulled my jeans up, straightened my shirt and sat on the corner of the bed.
"I'm home," Mum announced. "Where is everyone?" she asked as she gently knocked on the door before letting herself in.
"We're in here", I replied as Mum put her head around the doorframe.
Mum's eyes narrowed as she took in the scene before her.
"Everything okay?" she asked.
"Yeah, just... hanging out," I stuttered, hoping she couldn't see the guilt on my face.