Okay, look at these two gifs and tell me that is not basically the same look/expression in both. Laugh/smile, look away like a big tease, draw attention to lips, “shy” look back again.
Once you’ve decided that yes, yes they are the same expression, a little context to go with it:
The top gif is Benedict Cumberbatch playing Christopher Tietjens in Parade’s End, after Christopher has just met Sylvia Satterthwaite, whom he is obviously attracted to and is about to debauch in a train carriage.
The lower gif is Benedict Cumberbatch playing Sherlock Holmes in the unaired Sherlock pilot, after Sherlock has just had his life saved by John Watson, whom he is about to ask to have “dinner” with him.
*lets that sink in*
All cases are so fucking rested they could climb Mount Everest without getting tired.
Yep, when he chews on his face, that means he’s aroused.
/standing ovation
/slow clap
/wipes tear from eye