The end, end? Red Firewall? Trying to save him counts too with the Elecmon and you need the two prior two scenes that need to be unlocked too. Well, that and you need to have reached the red Firewall to trigger the last one. A lot of conditions, but that is why it is the path to the Hidden Ending. ^^ Pounding Boypussy and Pounding Slit are normal scenes on the other hand that are unlocked without hints.