Give Mom Plenty of Sperm: Final Chapter

In the final chapter, son Yuu-chan keeps having sex with his mother, vowing to fill her with semen until she is pregnant. He forces open her cervix, thrusts into her womb, and creampies her until she conceives. Months later they resume intense sex while she is heavily pregnant. She declares she will take only his semen and says they should do impregnation sex again right after she gives birth.