[Kratos blinks at Colette in mild startle, and his hand lifts to touch his face in something near to surprise.]

Am I?

[He would have thought that would be something he's forgotten. A moment later Kratos realises this is not the sort of thing a grown man should be wondering about, and curls his finger in as if he hadn't just tried to make sure of it.]

No, it can be used with multiple people. But unless the telepathy lines are regulated and everyone understands the mechanics of how to separate their messages, it's easy for communications to be lost or overruled by one another by accident.