Younger sister? Click. It had rung a little oddly with Lunge that Lelouch would take the time out of his schedule, organised to a T, to attend to someone for so long- but having a familial relation involved cleared matters up considerably. This time he didn’t attempt to hide his surprise, a blink and a slight widening of the eyes, deciding that it provided a far more natural reaction than anything he could have manipulated in. “You’re related? I should have guessed. It’s an obvious conclusion to draw in hindsight.”

After a moment he let his eyes drop back to the book, skimming the instructions while his hands worked the paper in the way Nunnally had demonstrated. She’d done well, so far- no need to apply too much pressure. “I had noticed, yes. He should be careful- it's easy to burn out in a place like this and it would be a shame if he were to overwork himself.” No guile there- the young man was useful as a contact, and in a place like this you needed as many eyes and ears in as many places as possible. His eyes wandered briefly to the girl's, more casual than accusing. “He doesn't seem like the type to ask for help, eith- ah.”

Apparently, he hadn't been focusing well enough on the paper. What should have been a neat diamond now resembled a lopsided pentagon. That wasn't right. Frowning, he opened it out, folded it again, and- the pentagon again. "Hmm." He'd gone wrong somewhere, that was fairly clear, but... he couldn't let himself get distracted. "You must worry about him a lot as well."