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When exploring Luna's house, you can contact mac on the tablet you get from the asylum

Text him until you ask him to come over, after the ghost has been captured Luna will be seen naked going upstairs

She will get in her room and ask you for some privacy, you can hear her and mac going at it but you can't see or interfere with the scene

HERE IS HOW TO GET PAST THIS HIDDEN SCENE.

Before the ghost is captured place a video camera in the room, when she is with mac you can watch them on the CCTV computer in the trailer

Apparently there is a second girl in the room which hints at the possibility of an orgy. 

use the mobile phone key pad and get the corresponding numbers for the word 'IRISNE'

you can see the animation of MAC and LUNA:

at LUNA'S house place 1 video camera in LUNA'S room

go back to the trailer use tablet to message MAC and ask him to come over

capture ghost, LUNA will go up to her room and would not let you in

go to trailer, you can watch her and MAC on the computer through the camera you placed in the room