Watch them like a hawk.
In my younger years - I bred a large male with a smaller female.
First mating went fine, she layed eggs, I attempted a double clutch. Second mating attempt - he became fat.
Offer the male food so that if he is hungry, he can fill up on rodents. Males often don't eat much when they want to get jiggy - but they do sometimes eat.
My 4' male has been eating quite well, yet eagerly mated with my 4' female just last Tuesday - and yesterday, again eagerly ate, and today - he's again out looking for the female (I assume that's what he's doing - he never has spent so much time just crawling around his cage - not until I put her shed skin in).
Anyway - offer him food a day or two before mating, and watch them closely. If they copulate, she's probably safe - but if the male doesn't attempt to mate, he may attempt to feed.
Local natural history museum has 3 kings in the same enclosure, and their big one of the three could eat the smallest of the three easily - yet so far, it hasn't. In fact, the three almost always are coiled up together. I think the key is making sure they are very well fed on rodents.
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3.0 WC; 0.2 CB L. getula californiae
0.1 WC; 10 eggs (7/11) Elgaria multicarinata multicarinata