how can these two still be so embarrassed with each other...
they already had sex! they should be comfortable with touching each other for gods sake.
(ngl its still kinda cute though)
Different contexts, my dude; plus, they're in public, illusion spell be damned. It's like a girl being perfectly fine being on a beach in a bikini while surrounded by hundreds of eyes, but is absolutely embarrassed being seen in her underwear by just one or two people.
In this case, yeah, they fuck like animals all night long, enough to make rabbits or tigers blush, but they've never really done too much intimate in public, so it's a new and exciting feeling. And Helvi may not be human, but herd mentality is a thing, so she starts getting embarrassed because Theo's embarrassed,
especially since she's reading his mind, more or less syncing with his emotions.