A/N: Written for both Fictober 2021 and the 5th ILY anniversary celebration hosted by writingwife83 and elennemigo. Rated K+.

"This was not part of the plan." The words are hissed, the voice low, angry, intense. The flat of a palm slams against the reinforced glass barrier separating them. "Eurus, I told you to leave her out of this."

She returns angry glare with emotionless stare. "Interesting," she says, with the slightest tilt of her head. "I thought you wanted him utterly destroyed. His heart burned out of him."

Jim Moriarty's expression remains fierce, a snarl on his lips and a fire in his belly (if she's interpreting that particular idiom correctly). "I told you to leave Molly Hooper OUT OF THIS!" he screams, this time pounding the glass with his fist. "You could have destroyed him by killing his little pet or Mycroft! You didn't need her for this!"

"No," Eurus agrees, her voice as calm and tranquil as ever. "I didn't. I already knew my brother was in love with her - what I wanted to know," she adds, eyes glittering with triumph, "is if you were as well."

"She didn't need to hear him lie to her," he snarls. "You're wrong, Eurus, he doesn't love her. He's incapable of loving her."

Eurus gives him a patronizing smile, deliberately designed to further infuriate him. He turns away from her with a muttered oath - tsk, the language that boy uses! - and begins stomping out of the room. His disguise is minimal; people see what they expect to see, as Sherlock so adroitly demonstrated on his first visit to Sherrinford, and Dear Jim has been here many, many times since she took control.

Poor Mycroft, she thinks as Jim waits for the lift. He thinks he escaped my control because I never seemed to ask anything of him that he didn't already want to do.

She smiles a cold, hard smile. Poor, stupid Mycroft, just as easy to manipulate as everyone else she's ever met. All it took was one simple request - a Christmas present.

And after that? Mycroft never even realized Jim Moriarty had been added to the 'safe' list, under one of his many noms de guerre. So easy to fool, all of them; she could take Sherrinford back over just as easily as she had the first time, allow Dear Jim to continue to slip in and out whenever he pleased. Trick her brothers and parents into believing that she remained the docile, earth-bound child she'd reverted into during the year since Sherlock had safely landed her lonely plane.

Then she sighs. Stands up. Walks toward the back of her cell - her room, actually, far less austere and cold than it had been in the past - and looks up at the camera. Nods. "Yes, it's him," she says.

When Jim reaches the top of the lift he's in for an unpleasant surprise. Guards, guns - and Sherlock. All waiting to take him into custody so he can stand trial for his many, many crimes - oh so many more than she's ever committed! - and allow her brothers the triumph his faked suicide had robbed them of.

She smiles again, this time a rueful curl of the lips. There's one more person who'll be waiting for Slippery Jim. The one who very obviously got away. The one he never planned to fall for, so focused was he on bringing about Sherlock's downfall.

Molly Hooper - no, it's Molly Holmes now. "Sister-mine," Eurus whispers, sinking gracefully onto the soft cushions of the futon Molly had helped pick out for her. It's a bright, garish yellow; Jim had been too furious with her to comment on the color or any of the other changes to her glass-walled chamber, but he'll put two and two together once he sees her waiting for him.

Sherlock might have been the one to bring Eurus safely back to Earth, but it's Molly Holmes who's helped keep her grounded. A remarkable woman; it's no surprise the two greatest geniuses Eurus has ever known (oh Mykie, you're smart but far too closed off from your emotions, glassed into your own personal prison, to truly rate with Jim and Sherlock) fell for her - and fell hard.

Eurus is half in love with her herself, a remarkable achievement considering her usual tenuous grasp on most human emotions.

Shy, sensible, morbid, socially awkward Molly Hooper, a quiet force for transformation - and one she and Sherlock and (yes, once he gets over his snit at being betrayed) Jim are all the better for having in their lives.