I think the best thing to do in this situation is to ban the 2 girls for this season only. Then put a restraining order on skater A from contacting skater C until skater C reaches age of consent in 4 more months. However, skater C will have to initiate contact after he turns 16 for the order to terminate. That way no more details need to be disclosed and we and they can move on from this whole unfortunate situation.