And apparently there's also this little edit I made some time ago. Which is just erasing visible parts of her panties, so that now it looks like she doesn't wear any.

What might she possibly be hiding down there?

Actually, if you think of it as an illustration to my "Slavya and the Horse" fanfiction (available only in Russian, sorry), she's not hiding what you think she is. There was an episode where she stole some lollipops from Semyon, the main character. He chased her until she slipped and dropped the lollipops into the dirt. Semyon believes she must have at least one left, as she was sucking on one during the chase and she couldn't have finished it by now. He wonders where she might possibly hide in though, given that the only piece of clothing on her is the red USSR T-shirt which has no pockets and is so short she has to pull its hem down to cover her shame. Wait a moment, what shame? That concept seems to be totally alien to the locals, surely so to Ulyana herself who was virtually shoving her pussy into his face just yesterday and peed all over him. With a triumphant face Semyon grabs the hem and pulls it up to reveal a lollipop hidden in her pussy. He takes it in his mouth and walks away. After he leaves, Ulyana laughs to herself at how easy it is to trick the urban guys, as she pulls another lollipop out of her ass and starts sucking it. She also picks another two lollipops from the dirt, cleans them by peeing o them, then shoves one in her pussy and another in her ass. Satisfied with her trophy, she walks away.