Draco slipped into the library at Malfoy Manor, exhausted after an evening entertaining Weasleys - Weasleys! A restorative brandy was what he needed. Celebrating the engagement of Severus and Granger wasn't something he'd ever envisaged.
Rounding the corner, Draco saw Severus, whose arms were around Granger. His shirt-tails were untucked; her hands caressed his bare skin. His left hand tangled in Granger's insane hair while his right tugged at her zip. She moaned softly as the zip lowered. Draco could scarcely fathom a kiss so passionate between his taciturn Godfather and the know-it-all Granger.
Feeling voyeuristic, Draco silently backed away.