Chair

Chair is the het ship between Blair Waldorf and Chuck Bass from the Gossip Girl fandom.

Canon
The relationship of Chuck and Blair through out the series:

SEASON 1 

Chuck and Blair shared their first kiss in "Victor, Victrola" (1x07) right after Blair broke up with Nate. And Blair even loses her virginity to Chuck.

Blair is trying to get Nate back on her birthday in "Seventeen Candles" (1x08). Chuck is jealous and tells Blair that he likes her and she rejects him. But than Nate tries to use Blair and Chuck is trying to comfort her and they and up kissing.

Chuck and Blair continue secretly hooking up in "Hi, Society" (1x10). They get later in a fight and Blair ends things between them and she hooks up with Nate.

Nate breaks up with Balir in "The Thin Line Between Chuck and Nate" (1x13) after he finds out she slept with Chuck. Blair tryes to get chuck back but he tells her he doesn't want her anymore.

They kiss again in "Much 'I Do' About Nothing" (1x18) and it seems that it's gonna last. They even plan their summer holiday together. But Chuck freaks out from having girlfriend and he lets her go on a holiday alone.

SEASON 2 

Blair arrives fom holiday with new boyfriend in "Summer, Kind of Wonderful" (2x01). Chuck is jealous and wants her back. She tells him that she's his if he tells her he loves her. Chuck can't do it and Blair leaves with her boyfriend.

Blair hooks up with Chuck and cheats on her boyfriend in "The Dark Night" (2x03). Her boyfriend gives her a second chance and she chooses him over Chuck.

Chuck helps Blair humiliating Vanessa in "Chuck in Real Life" (2x07) and his price is one night with Blair. They end up hooking up for real and Chuck wants Blair to tell him she loves him. She can't do it and this time Chuck is the one to.

Blair keeps chasing after Chuck in "Pret-a-Poor-J" (2x08) but it is pointless because she can't say those three words. Chuck and blair have later conversation basically saying they love each other but they would not work right now.

"O Brother, Where Bart Thou?" (2x13) is about Chuck's father's funeral. Chuck is grieving and doesn't want anybody around him. Blair tells him she isn't going anywhere because she loves him but Chuck doesn't say it back. He comes to Blair's later and she finds him sitting on a bed crying. They fall asleep hugging and when Blair wakes up she find a note on her bed. It is from Chuck and it says that he's sorry, that Blair deserves better and to not look for him.

Chuck comes back and tries to kill himself in "In the Realm of the Basses" (2x14) but Blair saves him.

Chuck is pretty mean to Blair in "Gone with the Will" (2x15). He comes to her apologizing later, but Blair tells him she's done and that there is nothing going on between them anymore.

Blair kiss Chuck in "The Grandfather" (2x19) but he tells her that she isn't the Blair he wants because she's been acting strange lately. He comes to Blair's later and fins out she's kissing with Nate.

Blair asks Chuck if what he feels is real or if it's just a game in "The Wrath of Con" (2x23). He tells her it is just a game. Serena asks him why did he say it and he answears that because he loves her but he can't make her happy.

"Valley Girls" (2x24) is a prom episode. Blair thinks Chuck was the one that sobotage her prom night. Than she becomes a prom queen which was really unlikely. Dan asks who voted for her and Chuck says that he did, 150 times.

Chuck finally tells Blair that he loves her in "The Goodbye Gossip Girl" (2x25) and they FINALLY get together.

SEASON 3 

They keep dating in season 3. Cute moments in 3x01, 3x03, 3x06, 3x08, 3x12, 3x14, 3x15.

Blair breaks up with Chuck in "Inglourious Bassterds" (3x17) after he chooses his hotel over her the worst way he can.

Chuck and Blair are suppost to be the happy couple on Dorota's wedding in "The Unblairable Lightness of Being" (3x18) but Blair reveals that they are not happy at all during the ceremony. She breaks up with Chuck for good later in the episode.