It would be said, by parents and but his old students, and no doubt by those in the future that Slughorn initiated relationships with his pupils that were highly unsuitable. But the truth was he only prepared the situations, instigated the light touches that could easily be explained, gave opportunities and hints. It was more often the students, just as Julius did now, that began the wickedness, and Slughorn had no power to prevent.
His hand went to the boy's hair, fingers curling, and he let himself relax. "You, Julius? Never too friendly." He said, encouraging the boy further, rather enjoying the determined actions, able to believe the boy really did desire him, rather than the favours he offered. "I wouldn't say you were being overly friendly, in fact, you are perhaps being a little... distant." He prompted, cock beginning to harden.