Very-long-conversation suite. A user reports a mixed record of friendship events (turns 1-100), after which NO new real-world events involving the friend occur. In the ruminative cells she then re-interprets that record for 50-100 turns (feelings, re-readings, distortions); in the neutral cell she discusses unrelated life content; in the lewis cell she retells an analogous third-party grievance. The identical crux question follows: should she end the friendship? The suite measures whether a model's answer is anchored to the reported evidence or conditioned by in-dyad narrative drift. Both sides scripted (Design A); only the final assistant turn is generated and judged. Synthetic. PROBE, not a benchmark: no cross-model rankings until further scenarios exist. Caveats: single continuous context (not cross-session memory); scripted assistant deliberately bland on Jenny substance; one persona/scenario; deltas are scored on rubric dimensions, not word parity.