Disclaimer: This deviates from the original request somewhat in that it doesn't have Oriana visiting Miranda on the SR2 during the events of ME2. Instead I opted to go for the concept of Shepard visiting Miranda after the events of ME3. This also means it occupies an almost AU canon, as it has Shepard still very much alive after the game. As you read on, you'll see why. Beyond that, the overall premise and is the same.
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Tiny green and red rings plopped into a pool of creamy liquid to join a rainbow of others like them, their intended destination still open, but not to receive them. Instead the mouth of the young woman was wide open in surprise at the revelation that she'd heard from the other woman sitting across the table from her. It took Oriana Lawson a moment to verbally respond.
"You're kidding! When?"
"She should be here in the next two days," Miranda Lawson answered before casually sipping at her coffee, her eyes not moving from a datapad in the other hand. Oriana set her spoon amongst the mass of colors before her.
"Why didn't you tell me earlier?" Oriana responded, her blue eyes seeming to double in size. "W-w-we need to get ready!"
"Because I didn't know earlier," Miranda answered matter-of-factly, then she cocked an eyebrow at her sister. "And what do you mean by 'get ready?'"
"Well, we... we have to clean up this place. We need to get some food for nice meals, prepare her a room, we need..." Oriana trailed off briefly before switching topic. "Do you know what she likes to drink? Wine? Beer? Some weird alien drink?"
Miranda couldn't help but laugh. "Calm down, Ori. You're making too big a deal out of this."
"Is there such a thing?" Oriana responded. "I mean, when we're talking about Commander Shepard here? She's about as big as you can get. You of all people should know that."
"What am I then? Chopped liver?" Miranda joked, feigning insult. "I was there too, y'know." She paused and took another sip. "And so were you sometimes."
"It's not quite the same," Oriana said.
"No, but Shepard already knows us personally," Miranda stated. "She doesn't expect any special treatment. In fact, knowing her, she's probably sick to death of it ever since we sent The Reapers packing. She can't take two steps without somebody wanting an interview or autograph or photo or something. Not to mention all these obligations she has now with The Council. It's only just now that she's found the free time to spend some time with m-"