I rushed in the door and found Mom standing in the living room with her head in her hands. She whimpered softly and didn't look up when I approached her. I put my hands gently on her shoulders and directed her to the couch, sitting her down. I nodded towards the stairs, and Cassandra took the hint, sneaking upstairs to get changed.
"What's wrong, Mom?" I asked. "Did something happen?"
Mom put her head against my chest and cried. "I... I just... I couldn't do it. I was finally going to get over him, but then... I saw the pictures and I couldn't move on. I called the guy and canceled our date and..." She trailed off with another barrage of wet sobbing.
"Hey, slow down," I said. "You mean you're still not over Dad? Do you want to talk about it?"
She looked up at me, eyes foggy and tear-filled. "You look so much like him. Your nose. Your hair. Your body. Even your smell, God. It's all him." She leaned into my chest again and took a deep whiff of my scent, seeming to melt into me. Her tits pushed against my arm. They were even bigger than Cassandra's, touched up and perfected for the modeling industry.
"Um, I guess so," I said, laughing uncomfortably. "I'm sorry about your date, Mom. Listen, how about me, you and Cassandra go out for a movie or something. It'll help take your mind off things."
She seemed amenable to the idea. Cassandra came down wearing denim shorts and a crop top that showed the bottom of her boobs when she lifted her arms. The silver necklace Mom had given her was nestled in her cleavage. She gave me a defiant look, daring me to say something. I just shrugged in exasperation.
'This family is a mess,' I thought. 'I guess I'll be the one to keep it together.'
All three of us went to the movies together. Cassandra and Mom colluded and finally decided on watching the romantic comedy 'Back with my Ex?', which only made me want to die a little bit inside.
Cassandra insisted on sitting nestled up against me in the theater, hugging my arm with her head resting on my shoulder. Mom didn't seem to notice. She had snuck vodka into her soda and sipped on her drink like a toddler suckling at a breast.
As soon as the lights dimmed and the room went dark, my sister sprung into action. Like a cat, she slid down so that she hovered over my lap and undid my pants. I glared at her, but I could hardly make out her outline in the weak reflected light of the screen. Luckily, Mom was completely focused on the movie and didn't notice her kids' frisky behavior.
'This kid. I swear she does this just to get back at me.'
Cassandra pulled out my cock and kissed all along my shaft and head to get me hard. She stroked it, running her tongue along the back of my cock head.
Just as I was getting into it, she bit down on my shaft and almost made me cry out. I had to bite my lip, body going stiff as I held back a shout. I glanced over at mom, but against she seemed to be too preoccupied to notice. Cassandra smiled up at me, and I gave her the middle finger, but she didn't seem to pay that any mind.
She dove right back down, wrapping her lips around my member and squirming her tongue around my tip. She slid her mouth up and down my cock, dragging her lips. It was extremely pleasurable, which made it hard to sit still properly. I had to grab the seat's armrests in a white-knuckled hold as my sister sucked me off.
She was being uncomfortably loud, smacking and slurping at my long, hard member. Luckily, the movie played over most of it, but if Mom was astute she could have picked up on it. Maybe she was angry at me for taking Mom out. I don't see how I could have acted differently, considering it seemed like she was on the edge of a proper breakdown.
Cassandra used her teeth a bit more than I would have liked, letting them scrape against the bottom of my dick. She seemed to get a kick out of torturing me. It reached a point where I'd had enough, and I grabbed her hair with both hands and started thrusting into her properly. This forced her jaw to widen to its absolute point, and my dick hit the back of her throat as she gagged and drooled.
I finished in her mouth. Not excited at the prospect of a messy cleanup, I made her lick up every single drop of cum before swallowing. She slid back into her own seat with a final squeeze of my crotch, and not long after the movie wrapped up with the main protagonist realizing his faults and going back to his ex. Mom cried big bear tears and I offered her a napkin.
Mom seemed happier once we got out of the movie theater, if more than a little drunk. We got dinner at a nearby dive and took the bus home. I had to help Mom in places as her footing was a little unsure, and several times her tits were pushed up against me, uncomfortably close to falling out completely.
When we got in the house, I had Cassandra put Mom to bed while I cleaned up the mess in the yard and boarded up the broken window with some cardboard.
I got back in and Cassandra had come downstairs. We embraced in the hall, and she pulled me down for a kiss.
"You promise you actually want me?" she asked. A bit of her characteristic snideness had been replaced with genuine uncertainty.
"I promise," I said. "I can't really explain it, but it feels... good, being with you."
She grinned. "Good. Up for another round, then?" She tugged at my crotch.
"I've still not forgiven you for earlier," I said. "We're gonna have to work on your attitude, Sis."
She pouted, but let herself be led upstairs. We both slept in my bed that night. She snuggled up against me and fell asleep within minutes, but I was awake for longer, staring at the ceiling with one arm on one of my sister's heavy tits and the other behind my head.
I had meant it. I really did hope things would work out with Cassandra. It was an unusual arrangement, to say the least, but one I felt I needed. There was no posturing with her. No honeymoon period of getting to know her before the inevitable falling out. I knew everything about her, and she knew everything about me. We'd loved each other since we were kids, it was just deeper now.
"You think too much," Cassandra whispered in my ear. She bit my earlobe. "Sleep with me."
I chuckled and closed my eyes after a long day.
==========
My alarm didn't wake me up that morning. I was surprised to rouse from my sleep at the sound of the doorbell. The Alister family didn't have many friends.
I untangled myself from Cassandra's splayed arms and legs and jumped into some clothes, a pair of slacks and a baggy t-shirt. All the while, the insistent ringing spurred me on.
'Must be something important,' I thought as I went down the stairs two steps at a time.
I opened the door. There stood a tall, stately man in a suit with messy but stylish hair that tumbled in perfect, black curls. He wore a bright smile, hands in his pockets. Behind him on the curb stood a shiny silver car that must have cost a fortune.
"Andrew," he said. "You must be the man of the house. May I come in?"
He didn't wait for an answer. He pushed past me into the house, wandering around the kitchen. He opened the cupboard under the sink and threw away his gum.
"Who are you, exactly?" I asked. I followed him as he walked into the living room, watching him with my hands on my hips.
Andrew turned to me and smiled. "Oh, I'm very sorry. I get a little caught up sometimes. I'm looking for Tessa. She's your..."
"Mother," I completed.
Andrew nodded. "I see. You have her eyes, I can tell. Is she in the house? I would very much like to talk to her."
I gave Andrew a once-over. He seemed nice enough, but I could put two and two together. He was probably the man Mom had agreed to go on a date with, only to reject. Knowing her, she probably didn't have the mental faculties to deal with an awkward situation like this.
"Actually, she's not in," I answered with a manufactured smile. "She slept over at a friend's house. Maybe you could catch her some other day."
Andrew took his hands out of his pockets and placed them on the leather couch's backrest. "I see. I'll have to try again later, then. I'm sorry for barging into your home and taking up your time. I'll be on my way, then."
I shrugged. "I could brew you up a cup of coffee if you want."
"Nah," he said. "Not much of a coffee drinker. Do you think I could borrow the bathroom before I go?"
"Sure."
I waited patiently while he was in the bathroom, then saw him off.