Is there a length of time you have to wait before introducting the rabbit?

I've been with this guy a few times but I'm not sure if I should suggest using my rabbit during sex, to be honest its a new toy and I cant seem to work it on my own, I'm never turned on enough.

Is it a good idea to ask or not?

Hiya, I would wait till you no your partner better. Also you need to spend time practicing by yourself. try reading erotic stories to get in mood, then use the ears on your clit. (practice controls before hand so you no whats what.) when your fealin ready just go for it. but try n keep ears on your clit all time. mind blowing orgasms garanteed.
hope this helps. xx