Rick could not bring himself to willingly retain the knowledge of which Beth is a clone. He had the memory stored on a Mind Blower™, but he stopped halfway through. What was the point, he thought, nobody else cared anyway. He was a terrible father.
Meanwhile, the rest of the family had to revise their living arrangements now that they had a second Beth living with them. Obviously, she couldn't sleep with Morty or Summer: that would be a little too awkward. Rick wasn't an option, considering the falling out they had. Then they came up with a solution that all but one agreed to.
They made Jerry sleep on the couch. Three guesses as to who objected.
Two Beths sharing a bedroom was weird and unusual, but it was nothing unlike the typical weirdness Rick put the family through in episodes previous. Every morning, when one Beth would go through her daily routine, the other Beth would be close by, going through the exact same motions–like a reflection in a mirror!. This ranged from waking up, brushing teeth and making breakfast to exercising, getting dressed, even showering. Of course, one would still have to wait her turn while the other was on the toilet.
That wasn't to say the Beths were exact copies. Space!Beth had a lock of her hair missing, a scar over her eye, a pierced eyelid and robot innards here and there–all of which memories of the battles she was in. Mom!Beth simply had a stitched scar on her neck (Rick came in one night and removed the memory-merging device from inside her neck because it was useless now that Space!Beth pulled hers out).
One night, the two Beths were alone in their room, with no Rick or Jerry to bother them. Space!Beth held what looked like a space bong in her hands.
"Here's something I picked up on Rigel VII," she said.
She lit the bong and brought the hole to her mouth, inhaling the fumes contained within.
"Here, you try it."
Mom!Beth gave it a try, but her eyes opened wide and she coughed it out.
"I don't know how Rick manages to stand this stuff," she said, setting the space bong down.
"You'll get used to it," Space!Beth assured.
"Nah," said Mom!Beth, "Gimme a bottle of wine any day."
Space!Beth chuckled.
"Oh my gah…you're more like Dad than I am!"
"Come here," said Space!Beth, pulling Mom!Beth into a smooch…with tongue.
"Woah! Is it just the space weed, or did I really enjoy that?"
Nobody knew the answer to that.
The rest of the evening got a bit too steamy for FanFiction's tastes, so we're just gonna skip over it.
Rick watched the whole thing on a small TV screen in the garage, through a webcam he installed in the Beths' bedroom. To be fair, though, said webcam was for their safety; should a brawl occur between the two, he'd be the first to know–he could step in and intervene, earning his daughters' respect.
Morty entered the garage. He saw what his grandpa was watching on the screen and blushed, making that 'w' shape with his mouth.
"Rick, is this the reason you won't tell Mom and Mom which one is the clone?"
Rick's pupils shrank, his eyes wide open, and, blushing, he turned slightly to Morty before responding.
"...NO!"
An awkward pause followed before Morty asked Rick another question.
"Could I have a clone too? Or the address to a dimension where I'm a cute girl?"
"I'll pretend I didn't hear that," said Rick, covering his ears.
In hindsight, he thought, the webcam probably wasn't a good idea.