It didn't linger, because the moment he'd kissed her Draco had felt that same sort of dizzying electricity he felt when she touched him or brushed against him or bloody sat too near him. But stronger, and even more like he should remember it, which made no sense at all.
When he pulled back from her though, her eyes were closed and she looked so flushed and fragile that he found himself leaning in again, kissing her more earnestly this time.