"WHAT DID YOU CALL ME?" roared Jonah.
"I mean Daddy! I'm so so sorry Daddy, but please, you can't make me-"
"I can make you do whatever I want, little girl, and you'll do it or i'll tie you up with a vibrator in your pussy and leave you there until you've cum a dozen times. Now I will hear not one more word of protest or that will be your fate. So open up and suck, bitch."
Tears streaming from her face, Stephanie complied. "Yes sir, daddy." She said, and brought her lips to his erection. She was in a daze as she opened her mouth to accept him inside of her. She tried not to think about what was happening, but as his cock passed between her lips he began to give her orders on how to please him, and "Pay attention, girl." was his first. At first Stephen howled in rage and despair inside, but the more she sucked, the more he diminished. The blow to his pride of sucking a man's cock was a direct attack on his pride, his maleness, but her pussy rewarded the submission with pleasure. So as she licked and sucked and swallowed, she became less Stephen and more Stephanie. Soon he was vigorously face fucking her, and she tried to pull away but he held her still. She sensed him reaching his climax, and knew that if she let him cum that would be the end of Stephen. She wanted to resist, but she was broken. She'd lost. Then he came with a roar and a satisfied groan, pouring his semen down her throat. "Ah yes, good girl." he said. "Very good girl, at least at the end. You took my seed like a proper bitch." He looked down at her then, deep into her eyes. "Yes, yes, I've just about broken you, haven't I?" he said as he stroked her hair. He was actually gentle as he caressed her locks, which was a first. "Well it's about time, I suppose. I knew you weren't worthy of manhood, so it was just a matter of waiting for the right time to break you into a proper bitch. What say we make it official, hmm?"
She just stared back at him blankly. "Oh my, a bit out of it are we? That's alright. Just get down on all fours and daddy will handle the rest." Still basically unconscious from all that had happened and the excess of submission hormones, she complied without even realizing what was happening. She waited. Then he thrust himself inside of her. Realizing what was happening, she began to sob as he worked up a rhythm. She didn't have the will to resist him anymore, but she still didn't want to be a girl forever, even if it felt so good. She knew it was a useless struggle, though. Even if she became physically male again, Stephen was gone. She'd never have the will to resist anymore, and sooner or later she'd end up permanently female. But as pleasure mounted, she knew orgasm was coming. She almost welcomed it, because then she wouldn't have to fight anymore, but still tears came from her eyes. "Sssh don't cry, baby girl" said her father in a soothing tone. "I know I was mean when you were a boy, but that's only because you were a lousy boy. If you give in, you'll be my little girl, and then I'll take care of you just like that father at the supermarket took care of his little girl. I'll buy you pretty dresses and jewelry and I promise I won't make you fuck anyone who would hurt you."
At this unprecedented tenderness from her father, her last wall of resistance broke, and she knew she was a girl. "Take me, daddy!" she cried. He growled and captured her lips as he pistoned his length in and out of her with renewed gusto, eager to finalize her girlhood. Her orgasm crashed like a tidal wave, and then another and another. She screamed in pleasure as she surrendered completely, and looked down to watch her trembling pussy being pounded, knowing that she'd have it for the rest of her life, and as the virus used the orgasm to finish altering her mind, the thought filled her with glee. Every last scrap of her pride and resistance was gone, and so was born the girliest girl that ever lived, as of course had been her father's intention. "Oh, yes! YES! I love you, daddy! Don't stop fucking meeeeee!" She cried.
And indeed they went at it for quite some time, until she couldn't handle anymore. Thanks to his genetic alterations to himself, his stamina lasted that long, and he filled every one of her holes. Finally he filled her with his cum a last time, and then took her in his arms. She purred in contentment and beamed up at him, and cooed as she rubbed herself along his still hard length. Being a girl was amazing. Why had she ever resisted? She was so thankful to her daddy for showing her what she'd been missing.
Jonah kissed the top of his new baby girl's head and smiled. He'd certainly call that experiment a resounding success. At this rate, it wouldn't be long until he could turn the entire WORLD into his own harem of horny little sluts. It was only right. He was clearly the only one worthy of manhood.