WASHINGTON: Just what did that "improper" relationship involve, anyway? As Monica Lewinsky returns for a second round of grand jury grilling Thursday, a special issue of TIME reports that her account of the White House tryst may be significantly damaging to President Clinton. While the President denied perjuring himself by admitting only to receiving oral sex, Lewinsky told jurors that Clinton fondled her breasts and genitals -- presented with a definition of sex that unquestionably covered such activity, President Clinton had in his January deposition denied having a sexual relationship with Lewinsky. When presented with her critically different version, the President refused to reconcile the discrepancy by declining to answer questions of a "graphic and offensive" nature.