I have enjoyed wearing diapers for fun for a long time and the feel of one, whether wet or dry is a great turn on for me.
Although I never wet myself when having sex, unless my partner wants me too, I find I can't orgasm when masturbating unless wearing a diaper. I enjoy both disposable and cloth diapers and will sometimes put one on purely to masturbate in. I like to lie on my back on the bed and stroke myself through the diaper, wetting myself as I do so.
As the wetness spreads along my pussy I get more and more horny and that's when I will take my vibrator lubricated with baby lotion, loosen the top diaper tape or undo the pin and hold my vibrator against my clit. It never takes long before the intense feelings build up and when I feel my orgasm approaching I add more hot pee to my diaper which instantly takes me over the edge.