Much like Allen, and much like Lavi, Lenalee's train of thought is following a similar 'just like home' track. Although she isn't as aware of how long it's been since they've been together in a room, she is very acutely aware of how long it's been for her-- how impossible this would be at home-- and that little memory she clung to during Jerry's feast.

Yes, they're trapped somewhere that by rights they shouldn't even know exists, and she remembers things no-one else does, and Allen even more so, but... she doesn't care.

(That's a lie; she does-- but she doesn't want to care, so for now, she'll pretend she doesn't.)

And so she brushes her hand over Lavi's wrist as he gestures her inside, murmuring a 'thank you', and turns on her own version of a carefree smile. To ensure that, as she'd grown so accustomed to, everyone but Kanda is wearing one and it's a little more like home, in spite of the knowledge that it won't stay that way for long. She needs this moment. Even if it's only a moment.