You can buy kits for making a mold of your dick. Do that first. Then use that to do this. Now you have popsicles shaped like your dick. Now your girlfriend can practice the dick sucking while she eats.
I don't need any practise. My first time i was told i was a natural
I you don't believe me, my secrets are watching porn since i was -9 and really being inlove with the guy so you can passionately lubricate and massage his dick wth the longest muscle i own hehehehehehehehehehehehhehehehehehe .-.