This is more than just a minor inconvenience. This could be employment trouble or even legal trouble. If she says "hostile work environment" or similar shit to the right people then you are fucked. My suggestion --seriously-- is to tell her you are embarrassed about what happened and that you are gay. I am not joking here. Gay is the perfect defense to any allegation of sex harassment with a female. You need not actually bugger someone. Simply tell her you are not interested in women.