Originally Posted by
bodory
Sounds very tricky for a lowly lounge access.
But if your "friend" really want to tempt it, I would recommend you to to buy a full fare ticket, enter the lounge with him as guest, then cancel the ticket and leave the airport.
If he does that during the same day, he should not be debited. Only bank authorization will be made (but count towards monthly debit limitation if he has any).