In Dulinovat, the materials are more resistant, Yudi and Anton can handle things a little better (Anton also suffers a bit from this, but at least he can use his hands without problems; it's his arm that's made of magma).

Now, when Yudi wants to be close to those he loves, he can hug Anton without problems since he also has resistance to the extreme temperature of the magma

He can interact with Irina without the slightest problem since she also has absurd temperatures (even hotter than Yudi xD)

With Ruby, he only has one option: he can cool the magma in his arms, but then they become immobilized, literally rocks. He can continue moving normally, only his arms don't do anything anymore, which is why when he hugs Ruby, the hugs are very looooong aksjakdj

And incredibly, Kishin handles it very well too; he can stay close to Yudi without any problems

That's because this is Kishin's "training" xD

Irina sometimes catches fire in her sleep and doesn't even realize it(゜∀。)