Bro, here is the problem facing the prosecution for corruption. In nearly all the cases unlike normal criminal cases, the main witness is not the victim but the culprit who provided the actuall bribe or the gratification.
The trouble is that Asians and their face saving nature would not allow them to testify to the detriment of their families and friends. So they are given leeway to paint themselves as not so bad. For women and when it comes to sex, it is even worse. The challenge for the prosecution is that she will not testify if she says she sought sex. So she has been given leeway just get the case going.
Actually I think it is now worse as the defence should not have revealed the SMS. It now shows her as manipulative and has the mindset to compromise individuals for the sake of making sales. I think Tan Chee Meng made a massive mistake. If you note, he objected to her sudden presence and actually stated that he was not prepared.
For a case like this, there will be massive artillery support behind the scenes all the way to AG. The best minds will be involved. I can also guarantee you that CPIB has access to all the SMSes. Looks like they played their hand very well and got the defence to reveal the SMS. In essence, they secured her attendence to confirm that gratification took place and it does not matter if she come out as Mother Theresa or Slut Central.
There should be more juicy details as Ng testifies.
Anyway, Ng would never ever be part of the civil service and he will lose all his benefits.