One afternoon, you begin to hear your mother's moans through the walls.
You don't think much of it, at first. She's been single for years, so you figured at some point she'd pleasure herself. It's just that normally, you never heard it.
But steadily, over the next hour, it keeps getting louder. And louder. And louder.
Eventually, you grow worried that something is actually wrong. You head over to her door, where the screaming is so loud it's as if there isn't even a wall between you, and knock. She doesn't respond, only continuing to moan. You knock harder on the door, calling her name and asking if she's okay... No response. Just pleasure.
...You brace yourself, and open the door.
A wall of pheromones and musk hit you all at once, the hot steam rushing past you to get out of the room. The smell is intoxicating, instantly fogging your brain with arousal. And then, you see your mother, and immediately know that something is wrong.
Her breasts have swollen considerably, each one exceeding her torso in size. Her hips have widened from their original modest size to pure birthing material. Her thighs have plumped up considerably. And she's leaking milk. A lot of milk. The flow seems to increase as she notices your presence, and she immediately yells out to you.
"Oh god, yes~! Please, get over here and fuck me right now! I can't take it anymore, BREED ME~!"