Would have been even cuter if he had said a very Dan like line 'And thats my sister'
It was really genies that the writers were able to let them have a sibling relationship but still keep them in character. In fact I think this might be the closest to reality sibling relationship on the show, cause lets face it siblings don't always get along like Jenny and Dan!

I love Chuck for looking after Jenny!

Chuck was so great this episode...

So sweet!

Totally.

It was just soo cute how he tried to protect her! If he had gone all Dan Humphrey with 'This is my little sister!' I think Jenny would have gone mad or smtn! But he was like the best brother anyone can have!

That scene where he saved her was SO SWEET. I was swooning big time. And it kind of made up for the lack of Chuck.

i love them both apart but i don't really like their togrther scenes though chuck was cute big brother for sure <3

Chuck is just so awesome! I love his relationships with everyone.

i think he could have made a quiet threat kinda like. "Im Chuck Bass. If I see you near my little sister again well *threatening pause* even in Europe that means something"

It could have been in a very Chuck-like fashion