I don't know what your desires are cuck wise, but showing her how much she turns you on when you talk about it is never a bad idea. I've found that the little things get my bride going as much as foreplay. A lingering hand on her waist, a kiss to the side of her neck in passing, a random compliment in an unexpected moment all make her feel sexy and sexual. When you make her feel sexual, she'll think sexy thoughts. When she thinks sexy thoughts, if you've been discussing the cuckold life, I guarantee she'll be thinking about it more than just when you two discuss it. Giving her positive feedback reinforces your argument that her pleasure results in your increased desire for her. The more she thinks about it in a positive way, the better your chances.