[She complies, but it takes all her effort to make the movement seem like some sort of casual adjustment, so that she doesn't giggle and turn even more red and make some sort of other sound. All this because he's touching her thigh - in public! yes - but still, if he means to go higher - and why else would he get her to scoot forward - she will have to really work hard to make sure none of it shows where people can see.
...she still can't believe he's doing this, and she's letting him, it's exciting in a way she would not have thought she would like...]