Are their oral trainers dildos?

I have never had a blowjob and had a guy from a distance that I wanted to give a blowjob to when he came to see me. I was nervous and it was more important to me than him so I would feel more comfortable. I’m specifically thinking that maybe there’s some kind of toy that could train my gag reflex or provide some feedback if I accidentally bite it (I’m a bit scared that might happen if I don’t know what I’m doing) or Something else. If anyone knows anything that would help I would be very grateful.

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