I love how up until the first kiss, Lizzie and Darcy very rarely had any physical contact with each other, at least as far as we were shown.
For the most part they have only ever been shown standing/sitting awkwardly across/beside one another. The exceptions being when Lizzie awkwardly touches his arm in Episode #78 “The Lizzie Trap” when she is flustered by Gigi throwing her and Darcy in a room together, when she touches his shoulder to get by him in Episode #83 “Corporate Interview” and when Darcy lays his hand upon her shoulder/back to comfort her when she receives the Lydia news in Episode #84 “Ugh”.
Then after that first kiss, the awkward no touching spell is broken and now they can’t seem to stop touching each other. Their foreheads resting against each other when they break apart, the way Lizzie plays with his tie, or how Darcy leaves his hand resting on her back, it’s as if neither of them can fully believe that what they have wanted for so long has finally come to be.