Identification Challenge! Nudibranchs and sea slugs can be so fun looking. What do you think this curly guy is?

seen from Malaysia
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Identification Challenge! Nudibranchs and sea slugs can be so fun looking. What do you think this curly guy is?
I have been trying to figure out what these little crustaceans are for awhile, and I didn’t want to post until I had an idea. But I have no clue and I haven’t found anything close! Not sure if its some sort of parasite infestation, a newly hatched cluster of something completely normal on the reef, or a species I haven’t come across yet. Maybe you have an idea?
Identification Challenge! These two were so intertwined in their mating ritual, I am not even sure if they are nudibranchs or sea slugs. Have any ideas on the species?