*snort* I can absolutely see him doing the first one, and it would be hilarious. Not so sure he'd think of the second (but as a joke for Solas to play on her, hmm....)
Yeah, I can totally see it, too 
The Inquisitor pushes open the door to Sera's room, surprised to see her lying on the cushions of the window seat with a pillow clenched firmly over her head.
"Sera?" she asks, tilting her head to one side.
Sera yanks the pillow from her head and throws it across the room in frustration, heaving to her feet and beginning to pace the circumference of the room.
"What's wrong?" the Inquisitor asks.
"Don't you hear it?" Sera demands, spinning on the Inquisitor.
The Inquisitor tips her head slightly further to the side, listening. "All I hear is Maryden singing."
"That's it!" Sera exclaims, throwing her hands in the air. "Elgargling, Dirtyman, the drooly one. It's all she's been singing about all bloody day. Elves, elves, elves. Stupid, bleeding, sodding elves," Sera spits the last word like venom.
"I feel like I should be offended," the Inquisitor responds after a moment, all too conscious of the points of her own ears.
Sera waves off the comment, starting to pace again. Downstairs, Maryden begins to croon about the betrayal of Fen'Harel, and Sera runs her fingers through her hair, tugging angrily on the ends. "Augh!"
The Inquisitor can't help but grin.
"It's not funny."
"It's a little funny."
"Why are you here?"
"I came by to see Cullen."
"Cullen? What's Cullen doing here? He's never--" Sera breaks off, a strange look dawning on her face.
"I know, it is odd," the Inquisitor agrees. "But it's good that he's taking a break for once."
"Oh, that little ****," Sera hisses, pushing past the Inquisitor to the door.
The Inquisitor arrives downstairs right behind Sera, just in time to see Cullen tip his mug at Sera, a pleased smirk on his lips that she recognizes all too well.
"You did this," Sera accuses him, furious.
"Did what?" he asks, all innocence, but the Inquisitor can tell he's still smirking as he takes a drink from his mug. It's so adorable she'd kiss him if she wasn't laughing so hard.
She might have to restrain Sera from knifing him and Maryden right here in the tavern, but it'll totally be worth it for the look on Sera's face right now.