"Narcissa, get the hell away from me!" Severus roared.
Of course the girl didn't listen – when did she ever? Instead, she pulled her wand out of her pocket and pointed it threateningly at him.
Severus instinctively took a step back, only to bump in to Lucuis, who quickly grabbed his arms, stopping him from running. Severus looked pleadingly at his girlfriend, but Trinity just grinned evilly at him, waving his wand about as if to remind him that he was completely helpless.
A bottle was poking out of her backpack, and when he caught sight of the label he whimpered in fear.
"Do it, Cissa," Trinity urged, pulling the bottle out.
The other girl obeyed and suddenly a strong stream of water was flowing out of her wand, wetting Severus' head completely. Trinity squeezed the shampoo on her hand and began massaging it into Severus' scalp as Lucuis and Narcissa cheered. When she was finished, Narcissa doused him again before casting a drying spell.
Severus was near tears.
"How could you?" he croaked, fingering his now-silky hair. "You ruined it."