Why not introduce set toys into your relationship with her, buy her a dildo that's only a little bigger than your dick to start with to get her interested in trying bigger dick. Don't try pushing her into using the dildo, by all means ask her if you can use it on her, if she says okay slowly progress from there, letting her take the lead. On the other hand, if she says no, don't try push her into it, just say you'd like her to just keep it in her bedside table and if she has the urge to use it she can, and you don't need to know about it, even if you know she's using it (and she will) don't mention it to her for at least a few months so she builds more and more confidence. Then and only then buy one an inch longer and 1/2 inch thicker and repeat the process after she's been using it regularly it time coyly ask how she's liking the bigger size dildo and if you can fuck her with it, once again let her lead the way forward before up-sizing yet again.
Most women start their big cock journey with dildo's, trust me her interest in trying a real big cock will build quickly and will be looking forward to it happening.
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