The pill?

"Your...on...the...Pill?" Alex grunted, his pace increasing now the slow rhythmic creaking of the wooden bed frame increased in tempo, and the wet squelches of his cock in his Mom started to get louder, he had been rocking and making love for a good 20 minutes now, and he could feel his release close. He moved so her two hands above her head overlapped at the wrist, and with one hand held them tight above her, restricting her hands. The other slipped between his groin and her Mons, and his middle finger started to rub and tease her clit for extra stimulation. Again craving her orgasm before his, also increasing the risk of his seed entering her womb.

"No Alex. If I was fertile I would be, but after this long without having a baby, I stopped taking them five years ago." She said softly, sadly, admitting she'd given up on any hope of ever having a baby. She moaned as he took her hands above her head, his fingers teasing her clit besides his thrusting.

"Well..I..don't believe..you..are..I will..give..you..a..Baby..." His speed increasing, his stubbornness, and still believing it is his Father's Fault blinding him to her words. he then could not wait for her to cum before him and groaned thrusting in deep as his balls clenched up again and again, shooting more thick potent robe of cum into Suki's somewhat fertile womb, his tip molded to her cervix forcing by sheer pressure more seed into her womb.

Suki decided not to argue with her son. If it helped his drive to think he could, she wasn't about to dissuade him of the notion. She could feel her own orgasm getting closer, knowing that if they came together her womb would suck his balls trying to get his sperm up inside her belly. "Give me a baby," Suki moaned, "Fuck your own step-sibling into me Sean," she said, clenching down around his cock, her legs holding his thighs in, ensuring he stayed deep when he came, and came hard he did, his balls filling her pussy, cum leaking into her womb, spilling forth an army of swimmers, and equal amount getting pushed out around his cock to drip on Suki's ass, the white fertile station on her marriage. Suki moaned as her son erupted in her belly, spraying her insides with his virile young sperm. She didn't know that she was fertile now, as fertile as any women her age, so letting her son cum in her, especially when she was orgasmic and her womb would be sucking sperm in, was beyond dangerous.

All that mattered in this moment was the orgasm, the pleasure of her son giving her what her husband wasn't, making her feel desired, and more then just a trophy on a pedestal.