Telescope
Aurora gasped, then promptly slapped her hand over her mouth, despite the fact that - as she remembered five seconds later - she was atop the astronomy tower, and they couldn't see her, much less hear her.
She should leave, though, this was none of her business, no matter how curious a happening.
Still. . .
Aurora adjusted the nearest telescope to focus on the pair of elegant male figures near the entrance of the school.
She bit her lip. She had seen Severus after he had weathered explosions in his classroom, and yet he had never looked quite so . . . unsettled, and she wouldn't have imagined the Lord Malfoy looking so very mussed.
Her suspicions for the cause behind these two disparate states were confirmed as Lord Malfoy pressed his fingertips to Severus' jaw and brought him close, their lips meeting chastely.
Severus' hand burying in Lord Malfoy's hair, dislodging the ribbon that had been barely hanging on, assured her 'chaste' was hardly the extent of their activities, even if they were currently refraining.
When Aurora refocused on them, dragging herself from her thoughts, they were unhurriedly walking towards the gates - presumably Lord Malfoy was going to Apparate away before someone could see him.
~Fin~
Aurora was the name given to Professor Sinistra in an excerpt from an early draft of Prisoner of Azkaban shared on JK's website. Other information shared at the time was later changed, and of course there is no first name for Professor Sinistra in the final copy, but in lieu of any other, I went with this one.