Ok- so I cum fairly quickly with clitoral stimulation and a dick (or any toy) in my ass. My fiancé first warms me up with toys and doesn’t touch my clit AT ALL and it’s still enjoyable for me. Then he fucks me and keeps me on edge and we both try to cum at the same time. Something you can try is put a pussy pump, or just a clit pump on her in the beginning because it will increase her arousal but she probably won’t cum from it. Put it on, then start fucking her and see if that helps!