The look she holds a beat past the point of comfort

He tosses out something throwaway, maybe about the track playing or whoever just came through the door, and she lifts her eyes. On any other night she would blink first, hand over a courteous smile, give the moment its usual little rescue. Tonight she simply holds.
It is only a hair too long. Long enough that his sentence loses its footing and wanders off. Long enough that he reaches for his phone and mimes a notification that never buzzed.
Anyone watching from across the room would file it under eye contact and move on. He suspects it was more, or tells himself it was, which is the worse place to be. She handed him nothing he could repeat to a friend later. Only the pause.
The outfit runs out of a convincing alibi

She still keeps an alibi on hand. It was the first thing off the hook. She was behind schedule. The dress only reads that way because of the chair, the lamp, the angle, take your pick.
But the alibi starts slipping. The sweater slides and she leaves it where it falls. The jacket is off before the first drink even lands. The hem gets smoothed once and then abandoned. She is no longer dragging everything back into its most cautious shape.
That is the thing he clocks. Not some dramatic overhaul. Just the missing panic. A mirror was clearly consulted before she left, and now the whole table is expected to treat the result as a happy accident.
She quits laughing off every charged moment

He lands the compliment a touch too squarely, and the old routine would have spared the whole table. A fast laugh. A throwaway joke. ‘Oh, stop.’ Maybe a staged grumble about how tired she looks.
Instead she lets it sit. She studies her glass for a second and says, ‘Thank you.’ No scramble, no padding it in embarrassment so he can act like he meant nothing by it.
The table rolls on; he does not. A flat thank-you can feel riskier than any flirting when it arrives late and unhurried. It tells him she caught exactly where the line was pointed.
The small fix comes after his eyes, never before

A strap set right before anyone clocks it is just a strap. Hair pushed back before the conversation even starts hardly counts.
The version that stays with him comes after his eyes slip. She catches the glance. She waits. Then a thumb runs under the necklace chain, or she tugs the sleeve back into place, or she smooths the skirt with one hand before she looks up again.
Nothing large enough to pin on her. That is precisely the trouble. The sequence is already lodged in his head: the look, the pause, the small fix, that near-smile he will swear he saw whether or not it existed.