Inspired by a couple of the earlier scenes between Robert and Jane.

His days were dull, he had no purpose and felt it the way, at least that's what he thought. Since the war had ended, Lord Grantham felt even more reluctant to return to his previous lifestyle. Cora always seemed busy nowadays, he couldn't see why, she was no longer running a convalescent home, what was taking up all her time? How long was it since he last kissed her? Or even held her hand? He couldn't remember, months?
He sat in an armchair in the sitting room, to anyone who looked, he would appear to be deep in thought, but in reality he didn't know what to think. His contemplation was interrupted by the door opening and the sound of heels tapping on the wooden floor, they could only belong to one person, someone who he'd avoided through fear of temptation. He turned to see the face of housemaid Jane, his lover. He'd anticipated this moment, with longing or dread he couldn't tell. He stood up, took one last look at the fire and reluctantly turned to look at the woman he stole a secret kiss with in the pantry just weeks ago. The awkward silence they shared was unbearable for Robert, Jane wore a look as if she was going to cry, which she wore frequently around Robert. They stood just a few feet apart, he knew he should speak but It was her who broke the silence first.
"Beg ya pardon M'lord, I didn't realise you were in here" she wasn't lying, but she wasn't sorry, she knew he'd avoided her and she wanted to know why. But seeing the look on Roberts face, she turned to leave.
"It's quite alright Jane, I should be going up anyway" he made his way to the door but as he placed his palm on the wood, he felt a hand placed on his left arm.
"M'lord…" she broke off as he turned and they gazed into each other's eyes, hers full of confusion and sorrow, his filled with longing and guilt. They knew their options, they knew which was right and they knew the consequences of the one they wanted, however inevitable it was. Hours seemed to pass between them, he hadn't attempted to remove her hand from his arm causing the flicker of hope in her eyes to begin to burn in her mind.
Robert glanced at the deserted corridor outside the sitting room, then to his hand still on the wooden frame. He proceeded to shut the door, then using the hand he used to isolate them in that moment, violently gripped her waist, she gave a little gasp that didn't go unnoticed but Robert. He narrowed his eyes, attempting to read her expression, she was frightened, blinking rapidly, shaking and barely giving herself enough time to inhale between breaths. There was no doubt that she was frightened. His right hand still firmly on her waist, he raised the other to her face, caressing her soft cheeks with his fingers. A quick rush of colour came into her face, turning her cheeks from milky white to rosy pink.
There was no question of her beauty to him, she certainly outshone Cora by any means. Parts of him hated himself for thinking this and to allow things to begin, it wasn't fair – to anyone. But yet he couldn't help knowing she made him happy, something he hadn't felt in a while, so how could this be wrong?
He returned to the moment and took in the beauty that was her face, her pale blue almost grey eyes on the brink of tears, her soft rosy cheek in his hand and her quivering lips.
'No' he thought to himself, he mustn't be tempted by those lips however inviting. But everyman has his weaknesses and this was Roberts. He slid his hand to the back of her head and pulled her into him, pressing his lips against hers. He heard her give a little yelp which she quickly turned into a moan as she put her arms around his neck, using this as a clear sign of no objection, he parted his mouth and kissed her with such a passion and hunger she couldn't help but moan louder. She felt the change though, he kissed her with such a vigorous need that when they broke away she was so breathless she could barely stand. Feeling her trembling, Robert held her close to him, her head on his chest and his head resting on hers, as he stroked her soft hair, he couldn't help but feel a surge of guilt wash over him.

"I'm terribly sorry" he muttered, not sure what else to say. "I shouldn't be doing this but…" he broke off, it was so ungentlemanly to tell her how he felt but he needn't have worried as she finished his sentence for him.
"…but you want this" she was so quiet it could have been mistaken for a breath. The awkward silence returned before she lifted her head and he gazed into her eyes once more.

"Yes, I do" he moved his hand to fiddle with her hair causing a few strands to come loose. He stared enraptured with her increasing beauty, he began combing his fingers through the rest of her hair, more and more fell loose, the occasional hair pin falling to the floor, he kissed her lightly as her lace headband fell to the floor. He held her face in his hands, her straight mahogany hair now cascading down her back. Her chest rising and falling rapidly, her breathing inconsistent, the expression she wore was one of fear, want and a hint of lust. He released her so she could stand in front of him. Still holding her upper arms, he examined her fully, taking in every inch of her beauty as a fire spread through his body. She stared at the floor, unable to look at him, nerves took over again.

"You're beautiful Jane" he finally managed, bringing her closer to him again, still watching her intently. Jane looked at her hands, separating their chests.
"Really, you are" attempting to convince her, he ran his fingers through her hair running his index finger down her neck before gently kissing it. Jane gasped, her fear leaving her as she closed her eyes and stroked his hair.
He moved back to her mouth and as he went to kiss it they heard the door open as they turned in horror they came face to face with an equally terrified Anna.

Always happy to get reviews, I will write a chapter 2 if you think I should, please leave your comments :)