[victoria]

firstly i wonder why she refuses? have you talked to her about it? if not i suggest you do with out trying to make it seem like your trying to convince her to have oral sex with you otherwise she'll probably shut you down. that way maybe if you knew why she's refusing you could find a way to get her into it.
if it's because of a fear or a bad experience in the past i'd say take your time. phobias and bad experiences are harder to overcome than just not wanting to try it. (non sexual example: i had a bad experience with a dog once and it took years before i wasn't afraid to be around one again.)