Yeah, nice tiddies alright, but what's up with this scene.
Why the sudden embarrassment, what did she expect would happen?
She can't be that oblivious, he was clearly hesitant the entire time.
To me, it doesn't seem that strange at all. It isn't an issue of her being oblivious, just being a person with emotions and hormones. Honestly, the more I look at the scene the more I like the reactions despite them being cliche.
She already likes him. (Existing emotional connection and friendship.) She found out it was because he was in danger and had to escape. (He might not be here forever) She found out he was the one who warned everyone. (He managed to make it and probably saved others. He is 'safe' and able to protect others.) She saw he was dirty and was headed to the baths. (He's about to get naked.)
Then she put the situation together. And she got horny.
Then while high on the horny, she decided to give him a bath. It shows care and interest and lets her get handsy. It's something that can be sexual but it leaves her in control.
However, she didn't think it through, and when she actually full on saw cock, it threw her off. Then something awkward happened and threw her off her groove even more.
Then, once her mind was thrown of the horny, she realized just how embarrassing/bold it was.
Basically, emotional spike > safe intimacy > explicit intimacy shock
Or at least that's my take. Peeps get wild with the horny.