The prosecution's key witness, Ms Pang Chor Mui, was the one who initiated a more intimate relationship, former civil defence chief Peter Lim Sin Pang told the court when he took the stand on Monday.
Lim, 52, is charged with corruptly obtaining oral sex from Ms Pang, the former Nimrod Engineering general manager, in exchange for furthering the business interests of her company.
The court heard that Lim and Ms Pang, 49, got closer after three lunches and several text messages, which eventually turned suggestive.
Lim cited an incident in February 2010, when the pair was waiting for Lim's driver to pick them up after lunch at a Crystal Jade restaurant. He claimed that Ms Pang had "grabbed my arm towards her body in a suggestive manner".
Lim also stressed that he had never rejected her outright, on account of their close personal friendship since they reconnected in 2009.