It´s funny some of the stuff you can find when taking a deeper look into the code.
Looks like there was a full-on voyeur route planned for Ian, based off of his conversation with Allison re: the pics Jeremy sent him.
It was then apparently scrapped though.
An almost complete monologue about it is still in the script but not activated, then two scene placeholders. First Ian walking in on Holly and Clark in the office. After that slutty Holly supposedly sending him pics regularly. Later, in CH.12 there´s Ian spying on Lena and Holly at the beach.