Sorry about the delayed response but it probably won't. Revy isn't all that romantic to begin with, most that could happen is her becoming a wee bit softer. a small misstep may cause a little complication but that'll probably bump her back into place.

Its really just my opinion but I think it might happen. There were a few episodes or maybe a lot where she showed affection toward him. Whether it was in a sisterly way or romantic is unclear. I think so because she seems to be very jealous whenever any girl flirts with him *cough* Eda *cough*