Mr. Graves was indeed waiting for you when a car pulled up to his mansion with you inside. He was quietly sitting at the table, reading something on his Newspad and only noticing you when the front door was closed.
"Darling." He took his glasses off, placed them neatly on the table, and sauntered over to meet you. "I trust the shopping trip went well. With an unlimited line of credit, I can only hope the manager didn't complain this time about you "buying out the whole store" again."
"Oh, there was no problem, husband." Saying this made you grit your teeth. Despite being educated in some of the most expensive universities in Central South America, the agency's profile on Valentina revealed that she had developed a habit of speaking like an airhead to conform to whatever stereotypical expectations her husband held. He treated her like she was an idiot, and she acted like one so he wouldn't be upset. You could feel the anger boiling up inside, just like the real Valentina must have felt.
"Oh, that reminds me, darling. We have some unexpected company. Maria?"
From behind one of the pillars emerged a woman who was both shorter and had almost the same face as yours, and who was wearing an expensive sleeveless dress and swinging one of Valentina's favorite purses. "Sister! It has been too long! This is your house, yes? It is so...so big!!!"
Your racked your brain for answers. Valentina was an only child, according to her profile. The agency had put out feelers to see if she had any living relatives aside from her parents, but there was no one.
But here she was. Maria came strolling up and grabbed your face, kissing it on both sides. In perfectly accented Spanish, she told you to meet her in the bathroom. Mr. Graves clearly didn't understand, so you told him you needed some time to freshen up with Maria, have some sister time together. He nodded and went back to his Newspad with a complete sense of indifference.
Once you were safely locked away from his gaze, Maria, without any prompting, kissed you before you forced her off. "Who the hell are you? I don't have a sister!"
"No, you don't. But that gringo doesn't know better, does he? Besides, how could you forget these lips, Alice?"
You shuddered. There was only one person on this Earth who was allowed to call you Alice. "Diana?"
"In the flesh."
"But..."
"But why am I a barely five-foot high Latina instead of a nearly six-foot high redhead with freckles? Well, it's a long story, but the short answer is the agency thought you might need a partner, so they brought me back into the fold. I'll confess that being your sister is a little strange, but I couldn't possibly pass up the chance to see you after that night we shared in Berlin."
"But what do you mean, you're my sister?"
"I mean, those scientists of yours have completely transformed me right down to my cells. If you checked my blood, you'd see that we have matching genes. I am your biological sister."
"So, does that change anything?"
"No."
With that, you both shed your clothes and had long, drawn-out, mind-blowing sex. Being a bisexual, Diana knew every move in the book, and showed you how to lick her pussy, scissor, finger each other's snatches, and play her favorite sexual game, "toss-around", where you picked her up and spun her around in your arms before stopping and fucking whatever part of her was in your hands. By the time you called in quits, the two of you had nearly stained every inch of the walls, sink, toilet, and bathtub with your fluids.
"You've been working out, haven't you?"
"Only for the one I love, Alice." She kissed you, and you returned her affections.
"Now then, I have an idea for how we can handle your hubby. I've been observing him, and he seems to be your garden-variety perverted old man who just wants to shag you and then stick you in a corner. Why don't we give him a little sister double-team action or such?"