His head was swimming, his body was trembling. Digesting Sis' breast not only restored his health, but was driving him mad with lust for her. He needed to dump some of his sexual energy back to her. It was their way, giving and taking from one another that kept them alive. But he needed her now. Where was she?
He felt his mother's hand take his cock. He felt lips on him, at first kissing his foreskin but soon gnawing gently on his shaft. He sighed relief for Sis' attentiveness, not realizing it was his mom. He was still on all fours when she forgot herself and took him deep in her mouth. He tried to stay relaxed and enjoy the feeling, but when his nuts pumped out a squirt warning him he was about to release, a wave of urgency came over him. He stepped off the bed and abruptly lifted his mother from behind. He positioned her over his cock and lowered her onto him. She reached back grasping his buttocks and pulled herself down. He was barely half into her and she felt somehow different, but no matter. He began grinding in her and she started groaning in pain. Louder and more frightened with each thrust, Mom now realized her error. She was both terrified and exhilarated. Her son was finally going to fuck her...to death. He grabbed her breasts tightly, her weight and his pounding had already burst her uterus and was now making paste of her organs. His strength returning, his cock hardened like a metal spike and the pressure on her breasts rupture her glands. Her nipples puffed purple and sprayed blood. The damage in her was horrific but she could not scream or breathe. She tried to push off as he started to climax, but his arms held her tits so tight, his fingers tore into their flesh. He held off his final push until he emptied into her. Her blood ran down his dick and covered his nuts. He let a roar of triumph and penetrated her fully. His bloody penis appearing through mom's upper abdomen. The result was so satisfying he ripped off her left breast. The ruptured glands flew out across the room. She remained motionless for a few seconds, her eyes wide, her mouth gaping in a silent scream. Blood and meat dripped on the bed in front of them breaking the silence. Then she let out a death rattle and slumped on his cock. He pulled out smiling to himself how well he had done. Her body collapsed on the bed-sheets and he climbed over her and rolled her over to let her fill her belly with his cum. He stared into his mother's dead eyes.
"Mom? MOM!! NOOO!!"
His daughters came running in. They all held her, weeping....