Bia didn't wait a single second longer. Turned on by the scene between Mom and Sophia, she unbuttoned her denim shorts and kicked them off, standing in just her bra and panties in the middle of the room. With a look dripping with desire, she yanked me by the collar of my shirt, locking her lips onto mine in a deep, hungry kiss while tossing her panties aside.
"My turn, babe... don't keep me waiting," she whispered against my mouth, her breathing out of control.
I grabbed Bia by the waist and laid her back over the armrest of the couch. Mom, still naked and panting from the oral sex, adjusted herself on the cushions next to Sophia to get a front-row seat. I lined up my still-erect, throbbing cock at Bia's slick entrance and drove all the way in to the root in one smooth push.
"Ahhh... Lucas!" Bia let out a loud moan, digging her nails into my shoulders.
I began pounding into her deep and without mercy. Sex with Bia was the perfect mix of passion and raw filth. Her legs wrapped tight around my waist as I kept up a hard, relentless pace that made the couch creak. Mom and Sophia watched the whole thing, egging us on with devious giggles and provocative comments.
"That's it, son... fuck your girlfriend hard," Mom teased, stroking her own thighs.
I picked up the speed, feeling Bia's walls clamp tightly around my member with every stroke. She began trembling all over, her eyes rolling back at the peak of pleasure. With one final, deep thrust, Bia came hard, and I discharged a heavy, hot load of seed right at the bottom of her womb.
Still panting over Bia's body, I felt two soft hands grab my shoulders from behind. It was Sophia. She pulled me back gently, her mouth still slicked with cum and her eyes gleaming with pure greed.
"You ruined my pants and left Mom and Bia completely drenched... now it's my turn to collect," Sophia whispered in my ear, pulling me toward the middle of the rug.
Without giving my cock a second to cool down, Sophia dropped to her knees and wrapped her lips around my rigid shaft, taking a few greedy licks before turning around and shoving her full ass back toward me.
"Fuck me, Lucas! Fill me with milk just like you did with them!" she demanded, looking back over her shoulder.
I gripped her hips firmly and drove all the way inside her from behind. The third round of the day was brutal. I pounded into her with raw power, making Sophia's ass snap under my hard slaps while Mom and Bia sat close on the couch, cheering and touching themselves at the sight.
Sophia moaned loudly, without a shred of shame, pushing her hips back against mine with every thrust. The heat and relentless rhythm pushed us over the edge fast. I grabbed her waist with raw force, plunging my dick to its absolute limit, and unloaded another overwhelming surge of hot cum inside my sister, making her scream in pleasure as her body entered violent spasms.
I collapsed on top of her on the rug, thoroughly spent, while our living room remained submerged in the purest, most satisfied silence of family debauchery.