The Doctor's companions tended towards the curious. What other sort would be likely to follow a (more than) slightly mad man into a little blue box? A side effect of this is that they always ended up running off to explore when he told them to stay by the TARDIS. He had come to expect this.
On the off-chance he picked up a non-curious soul who did not go running off, odds are he'd find them rocking back and forth on the floor of the TARDIS crying softly to themselves and he'd need to put them back where he'd found them.
So suffice it to say Amelia Pond is very, very curious. Anything that goes bump in the night is bound to attract her attention.
Amy Pond could not sleep. She sighed to herself rolling away from Rory who was fast asleep and drooling slightly into his pillow. She looked up at the familiar ceiling of the TARDIS and the stick on glow-in-the-dark stars and sighed again.
She reached out with her foot to prod Rory, he mumbled incoherently in his sleep.
"Rory" she whispered, "are you awake?" She prodded him with her foot again. "Rory" she whispered again in a sing song voice. "I'm not wearing my nightie..." She quickly divested herself of the aforementioned piece of clothing just in case.
"Rory?" she whispered again in the dark leaning over his sleeping frame. He mumbled again. "Wait...was that in latin?" she muffled her giggle into her hands. It seemed her husband wouldn't be able to help her get to sleep tonight. She sighed. Sometimes Rory slept like the dead. Even if The Doctor crashed the TARDIS in the middle of the night she doubted it would awaken her sleeping husband.
"Well...if you're not going to wake up and ravish me, I might as well get a glass of water." She whispered as she kissed her sleeping husband on the forehead. She slipped back into her nightie and put on her furry bunny slippers.
Amy quietly slipped out of bed and strode down the corridors of the TARDIS. She had just gotten herself a glass of water when she heard something coming from the control room. A large bump-type noise followed by a strange, strangled yelp.
"Doctor?" she called. She strode quietly towards the control room, cursing the fact that her cricket bat was still tucked safely away under the bed. Keeping very close to the wall she quietly crept towards the control room. She could almost peer down the stairs from where she stood. She heard a crash, a thud, and another strangled yelp-
"River!...ah River...your parents are upstairs asleep- you really want to do...what are you doing?" The Doctor was silenced, apparently with another kiss. Amy peered forward just in time to watch The Doctor scramble to his feet towards the control panel with River in hot pursuit.
"Sweetie, bowties may be cool, but this one has simply got to come off." River's voice was low with a sultry lilt to it as she quickly untied his bowtie.
Amy peered forward, River had the Doctor backed up against the control panels, She inched back from the stairs.
"I should take you back to Stormcage River."
"After that lovely evening? All the wine and dancing? 18th Century France? I say it's time I had more to write in this little blue book..."
"But you and I...we don't...you know, do this" The Doctor was swatting River's wandering hands away.
"Don't worry Sweetie, I'll be gentle." River teased.
River lunged at The Doctor again. More strangled yelping, several crashing noises, and the TARDIS veered noticeable off course with several loud bangs and sparks emanating from the machinery. Amy saw a man's shirt fly across the control room, his braces flew across the room and landed right by her feet.
It only then occurred to Amy that she probably shouldn't be watching this. She slipped back along to corridors to see Rory standing befuddled in the hallway.
"RIVER!" The Doctor yelped loudly from the control room. "THOSE ARE MY TROUSERS!"
Rory coughed awkwardly in their bedroom doorway "Is the Doctor...are they?"
"Yup" Amy replied.
"Do you think..." Rory paused awkwardly "maybe we should give him a hand?"
"I don't really fancy getting in the middle of that thanks" Amy responded.
"Well, it can't go on that much longer, can it?"
Twenty minutes later both Ponds lay in bed staring awkwardly up at the ceiling. They didn't know quite what to say, and the awkward silence was continually punctuated by yelps and crashes, as The Doctor, who was now from the sounds of it running around the TARDIS in only his pants, tried to escape River's advances.
"Do you reckon he's going to give in anytime soon?" Amy asked Rory. "I could just shout down.."
"I would have given in by now.."
"Oh I know you would" Amy smirked at her husband. "Didn't take me nearly so long with you, once I decided what I wanted..."
"Actually, I'd only been fantasizing about it for...oh- say 8 years? It was a dream come true for me."
Another yelp, it sounded like they were closer this time. Footsteps in the corridor sounded close now...awfully close.
Rory looked over at his wife. "I think this is going to be a very long night"