Switch to doggie-style
From Torg Adventure
"Get on your hands and knees," you tell her.
Your mom hesitates for a moment, her eyes looking up at you, as if in seeming disbelief at what is going on, and what will still happen. But there is also lust in there as well. She hesitates, and you think she is going to refuse you, but then she turns over and raises herself up on all fours. You move behind her, and slide your cock into her again from behind.
"We shouldn't be doing this..." she moans, even as she begins moving with your thrusts. "This is wrong..."
"What's wrong is a world where almost everyone is dead," you tell her, driving into her hard. "Where humans are almost extinct, and my father wants to withhold a fertile woman, when he's shooting blanks."
"I'm your mother..."
"And I might be the last man on Earth that can get you pregnant," you tell her. You know you don't need to persuade her too much. She's already letting you fuck her, and her body is eagerly accepting your cock.
Your mom groans then, long and hard. "I-I guess desperate times call for desperate measures..." Her words are barely audible over the slapping of your flesh against hers. "But your father..."
"Don't worry about Dad," you tell her. "I'll take care of you, and Tracy and Milly..."
"Yes..." Your Mom is lost in passion again. "Take care of me... do what we need to do, to save the world..." Then her voice changes a little. "I want another baby..."
Then she cums again, and even to your overworked cock, your Mom's words and her still hot body squeezing your cock is enough to cause you to unleash another torrent of baby batter into her womb. You smile smugly, having now cum in every woman in your family. Possibly every woman left in the world at this point. Three women, three loads of cum. At least one of them had to have taken, right?
Fuck her some more/someone walks in/something else?
