So me and fuckbuddy talking about Xmas, she is horny bitch and mentioned she would like a dildo, and I'm thinking maybe I should get it for her.

For what it's worth, I'm quite big down there and was thinking about getting her one as big as me as subtle conditioning, in other words, when we're not fucking she'll be filling herself with it which i'm hoping will make it so she's no longer satisfied by smaller dicks and needs big dick to be satisfied, i.e. needs my dick.

Does that rationale make sense to y'all, or are there downsides to getting her a dildo I'm missing?