He answered by driving harder and deeper into her lurching body, building her up to a state of passion she could hardly endure.
"Harder!" screamed Erika, clutching at the cheeks of his ass, puffing his cock further into her sucking cunt. Aware of nothing but their overwhelming lust, Erika was unconsciously circling his asshole with her middle finger.
"Christ, baby! What a fucker!" she shrieked, her probing finger pressing against the tight ring of his bung. "Don't ever stop, baby! Don't ever stop!"
"Aaaaaauuuuuggggg!" he roared, giving a mighty lunge as he felt the tip of her finger tear through the tight opening of his shitter.
When he gave that frantic lurch, Erika thought he'd driven his cock clear up into her throat. Wanting him to fuck her even harder, she rammed the full length of her finger into the buttery softness of his rectum.
Completely crazed by the imbedded finger swirling against his prostate, Alan was driving his big thick pole into her like a maniac.
"Fuck baby, fuck!" Erika was screaming into his ear. "Don't stop, honey! I'm almost there!"
The writhing woman was barely clinging to her sanity as the intense ecstasy mounted and mounted throughout her body. Her taut nerves were virtually screaming with delicious agony, and the woman didn't think she could endure much more of it.
"Oh, sweet darling!" she squealed when she unexpectedly felt his white-hot jizz gushing up into her fuck-hole. The intense excitement of his thick cock-cream splattering against the slippery walls of her cunt triggered the wildest orgasm she'd ever experienced.
"I'm coming, baby, I'm coming!" she shrieked, grinding her grasping twat up to receive every drop of the glorious cum that was spewing out of his cockhead.
Clinging tightly to him, she let his magnificent shaft fill her cunt to overflowing with his slippery jizz. Locked in each other's arms, it was several minutes before either of them made any attempt to move.
Mary Ann sat watching them while she scooped up the cum her brother had just squirted onto her belly, greedily licking it from her fingers. She knew that now with her father home, life was going to be so much better for all of them. There wouldn't be any more sneaking around for any of them, and it would be so wonderful sharing their bodies without guilt or shame.