River loved Christmas with the Doctor. He took special care to pick her up on Christmas Eve and not a day sooner, mistletoe strategically placed around the TARDIS. He'd even been brave once and tucked it into his pants, but she'd laughed him off and he'd never done it again. She smiled as she thought about whether or not she should wake him up Christmas morning wearing nothing but his bowtie with some mistletoe tied into it. The bowtie-trick always worked amazingly well for her.
Voices nearby halted her train of thought and her feet.
"-looks absolutely ridiculous!"
"Oh, shut up, it's very sexy.'
"No, it's ridiculous."
She peered into her parents' room through the barely ajar door and had to stifle giggles. Her father really did look ridiculous, wearing a Christmas themed outfit that belonged on a male stripper with much less modesty and dignity than Rory. She thought he looked much better in the Centurion outfit, but she was his daughter, so anything that wasn't stripper-esque was better.
Amy sidled up to him with a sly look on her face, and practically draped herself on him and began kissing him. River knew they were hungry and lusty kisses, mostly because those were the type of kisses she always gave the Doctor. She backed away grinning, plotting about how to tease Amy later.
x-Amy-x
God, River was evil. She spent all of Christmas singing "I Saw Mommy Kissing Santa Claus" under her breath and eventually, much to the Doctor's amusement, outright singing it with a grin on her face. Amy's cheeks flamed whenever this happened, and Rory suddenly got very interested in whatever was closest. How did she even know about that anyway? Or was she just taking a lucky guess to see if she could irritate them?
When both of them were singing it in harmony Amy finally snapped, "I heard my best friend shouting my daughter's name." Her cheeks were red and she was breathing rapidly.
The Doctor smirked. "Yes, well she is very good with her tongue, and I don't just mean her delightful flirting."
Both him and River laughed riotously when Amy threw her hands in the air and stormed to her bedroom, yanking Rory along by the collar as she went.