Don’t be under the impression that your husband might misunderstand you when you propose him a new thing in the bedroom. Sex is something which should be enjoyed by both the husband and the wife and in fact when the wife comes up with a new way to double the pleasure, the guy would surely be excited about it; so tell your husband that you want to experience the pleasure you can derive by getting your vagina and clit sucked.
You mentioned you’ve earlier refused to suck your husband, but men love getting a blowjob as much as a woman loves getting sucked. But I don’t think he would refuse to suck you just because you refused to blow him. Express to him your desire and see for yourself his reaction. Oral sex isn’t good only when you receive it, it is equally good when you give it to your partner.
Both you and your husband can shrug your insecurities/inhibitions and engage in oral sex. Go into 69 position and explore yourselves. Communication holds a key role in the married life of a couple, so don’t hesitate to talk to your husband your desires. Have a good married life.