If you release it just right before you orgasm you should be able to prevent that refractory cycle to kick in. The trick is to stop touching your dick as you cum and wait to finish before stimulating it again. Good luck!
You can practice it while giving him a blowjob. When he is just about to orgasm, release his cock. If he loses the urge for sex or bacomes flaccid after ejaculating, you stopped touching his dick too late. Next time stop earlier.
When your hubby is just about to orgasm tell him to pull out and stop. Do not touch his dick while he is cumming. If the timing is right he will ejaculate but he will be able to continue without losing his erection.