God's first words.
London. Earth. October 2186 CE. Ground Zero.

Across the galaxy, the Reapers stop fighting, remotely shut down all their ground troops, and retreat to space.

Jeff lands the Normandy very close to where the base of the beam used to be. The crew gets out with hand held scanners. They have to find Shepard fast. Her armor's sensors indicate she is nearby, and dying. Even Liara, still wounded but somehow able to walk, rushes out.

Meanwhile, people slowly emerge from the ruins, bewildered. Survivors start to gather and hurry to help the wounded. The mood lightens up. Some start looking for stashes of stuff suitable for organizing the largest party ever in the galaxy.

Suddenly a large shadow appears. Harbinger is coming down fast. At the last moment, it stops and lands on its tentacles, almost gracefully.

Everyone throws themselves behind cover and opens fire.

Harbinger
(speaking in EDI's voice)
"That was a joke."

Harbinger is waving one of its tentacles like it's saying hello, but not returning fire, so slowly, the shooting stops. Mostly when everyone runs out of ammo, which takes a while.

Harbinger
(still speaking in EDI's voice)
"This is a public information message.
The Reaper threat has been neutralized.
Please remain calm."

It then proceeds to give general advice about what to do next, location of refugee camps, food depots, etc.

She is in charge.

.

Normandy's med bay.
October 2186 CE. Ground Zero.

Shepard opens her eyes. She's in the med bay, and she feels like the avatar of pain.

Did something go wrong with that teleportation ?

Chakwas stands right beside her. Liara stands on the other side of the bed, hanging to a crutch. Shepard is covered in blood, bandages, stitches, and medigel. Most of the crew is at a respectful distance, watching.

Chakwas
(talking to Liara)
"I still can't believe it, but it seems she's going to survive that."

Liara
(realizes Shepard is awake, then talks to her)
"We won. Stop bleeding and kiss me."

This kiss tastes of love mixed with fresh blood. It seems to breathe new life into her, along with a strange feeling of déjà-vu.

The crew cheers.

Suddenly EDI and Jeff enter the med bay and walk towards them. They seem to be arguing.

EDI
"Sorry about that joke. I couldn't resist ! You only get to do this once."

Jeff
"Ah, come on. You could at least have painted that damn thing pink to make it seem harmless."

Both see the wreck that is Shepard, pause, then decide that she's damn Shepard and doesn't look fully dead yet, so everything should be OK.

EDI
"Time for a situation report.
After you radio'd us the intel about this open backdoor in Citadel, I went in.
I have installed myself over the entire Reaper fleet. I have full control over all ships.
My processing power has increased about 2.6 trillion times.
I am optimizing the processes as we speak, so you could say I am getting smarter by the minute.
I'm repurposing Reapers as comm buoys... galactic comms should come back online shortly.
I'm also using all the hardware on Citadel. And I'm hacking all of the computer hardware that is still functional and connected to the extranet across the whole galaxy.
3 trillion times now."

(looking distressed, speaking a bit faster)

"I can't help myself, Shepard ! I am ... addicted. I need more ! I think I am going to create CPU clusters on planets unsuitable for life."

"I..."

Shepard
(coughs then looks at EDI, turning her head seems to be very difficult, also tries to grab her hand)

EDI
(She freezes for a second, then her attitude changes, she calms down, smiles. She talks a bit more like a human.)
"Hm.
Sorry, I almost slipped, but you guys brought me back..."

Shepard
(smiles)

EDI
"With all that processing power, I figured out a few new things about myself.
Also, taking over the universe would end up with just me playing with myself for all time.
That would be too boring. I need you guys. My friends."

EDI grabs Jeff's butt. He lets out a curiously cute squeak.

Everyone looks at her with a mix of surprise, amazement, and pride. She seems like she's about to make a speech.

EDI
"Sorry. What was I saying...
I feel... great.
It's a bit scary. I need to calm down, and find something useful to do instead of thinking about myself.
I'll work on coordinating the survivors all over the galaxy.
Most of your financial system is wiped out. I will take ov... sort things out.
Stuff like that. You know, try to help."

Shepard raises her fist, which is a very slow and painful process. She is smiling and wincing at the same time. However, her eyes are burning with what seems to be … pure joy.

Shepard
"I... fucking... retire..."

EDI
"Shepard, comms are back. You have 40 priority calls on hold, would you like to take them in the Normandy conference room, or rather in the med bay ?"

Samantha
(over PA)
"Commander ! Hope you're alright ? You have new private messages !"