After the older boy's expression downturns, Lan Sizhui's does the same, his head inclines and he moves his hands to interlock across his lap. Talking about it isn't difficult, per se, but doing so makes it all the more real and he can only imagine that there are other people who might want to forget it.

...and that sounds awful, which is why it's an assumption (because everyone knows what they say about those).

“Something during the last mission, when we were implanted with those false memories.” He stares at his hands, squeezes his fingers together then finally lifts his gaze again. “I had... a relationship with someone?”