In most cases, a disfellowshipping will ensue once found out by the nose of the elder body. Even before marriage, she can get caught with you in her house and be accused of fornication which is a disfellowshipping outcome. It would be by a nosey fellow JW who sees you too together.
That's very true in that some dubs who were seen being hugged by someone of the opposite sex were requested by their cong's BOEs and pulled into the backroom for a small JC. I know of a situation where this happened and the sister--who was quickly hugged by a coworker who drove her home from her job--was put on PRIVATE RESTRICTION/REPROOF for this happening. When it comes to the Borg/WT, ANY LITTLE THING sets them off!