What is the ruling on what the young man did in this case? And what should he do for his reputation, which has begun to be tarnished? And will the Commission for the Promotion of Virtue and the Prevention of Vice help him?

The act with the young man is not sodomy, but it is a prelude to it and a sexual perversion. The conditions of sincere repentance must be fulfilled, and one must seek refuge in Allah, asking for concealment. Advise the young man and remind him of Allah. If he does not desist, then threaten to report the matter to an authority that will deter him. To deny the accusation, use evasive language (ma'arid) or outright lying if necessary to achieve a legitimate Shar'i interest. Photos can be manipulated with Photoshop.