All at once, under the influence of the Chronivac, Chelsea felt her body drop an egg. Chelsea looked from Jeff, down to her own flat stomach, then back at Jeff. "Oh, God," she whispered, her voice trembling with fear. "Please don't do this."
"Too late," Jeff said. "It's done."
Both of them felt their worlds change as brother-sperm touched sister-egg. Just that quickly, Chelsea was pregnant with Jeff's baby.
Chelsea sank down to the carpet, her legs trembling too hard to keep her standing any longer. "What have you done?" She started rocking back and forth as the weight of the moment overcame her. "What have you done?"
"I've created a living emblem of how much I love you. That's what a man and a woman do when they're in love, baby sister: they create new life together." Jeff rose and crossed to his sister, wrapping her in his arms, pressing a kiss into her forehead.
She didn't even try to push him off; all the fight had gone out of her. She simply hung limp in her brother's embrace. "I'm not in love with you, Jeff."
He kissed her forehead again, then the tip of her nose, then her lips. "I think you could learn to fall in love with me," he said, then kissed her chin, then her throat. "You could certainly fall in love with our baby."
"There's not going to be a baby," she said, weakly. "I'm going to have an abor—"
Jeff waved his fingers in front of Chelsea's eyes, and it was like a wall fell down in her brain. "You won't ever think about that again," he said. "From this moment, you're not even capable of thinking that. And while we're at it, you're not capable of telling anybody who the father of your baby is. You're going to have a perfectly healthy baby, Chelsea, I'll make sure of it, and nobody but you and I will ever know it's our incest baby."
Tears sprung to Chelsea's eyes as she realized what he had said was true. Doing anything but giving birth to her own brother's baby, and keeping his secret, wouldn't be an option for her now.
"Listen," Jeff said. "If you agree to be my lover, Chelsea, I can, let's say, pause this pregnancy. Like, just put it on hold until we're ready for it. Or, thinking about it, I could make you six months pregnant right now. I bet you'll be so pretty with our baby growing on you. Or how about, you could hold our newborn in your arms right away, without having to go through the whole process." Jeff kissed his sister's clavicle, then kissed her breast, right at the collar of her shirt.
"What do you say, baby sister? It's up to you."