Author's Notes: a simple premise for a story. The Doctor and Amy are both seemingly-young attractive people spending a lot of time alone together. What if the way they spent that alone time was not PG-13.

Amy Pond was in the TARDIS bedroom in her underwear. The Doctor had her tied to the bed, her wrists bound to the bedpost with tightly knotted rope. In her tight blue underwear, she was wriggling her body to escape the restraints. He was watching her every movement with a wicked smile on his face.

The Doctor couldn't keep his hands off Amy. He had never met a woman like her in all his travels through time and space. Her fiery red hair, her curvy figure, and her fiery personality were a perfect match for his own eccentricities. And tonight, he planned to explore every inch of her body.
He stood next to the bed. His hand reached out to touch her bare shoulder. A chill ran down her spine as he traced his fingers down her arm. She tried to pull away, but the bindings held her in place. He leaned in close, his breath warm against her cheek.

"Doctor," she whispered, her voice husky with desire.
"Do you trust me, Amy Pond?" he whispered in her ear.
She nodded, unable to speak. She trusted him with her life, but she wasn't sure about this. He stepped away, rummaging in a nearby drawer. When he returned, he had a small bottle in his hand.
"What's that?" she asked, her voice trembling.
"It's a special oil I picked up on one of the moons of Fetushi. It's supposed to be the best for massages."
He climbed onto the bed and straddled her. She felt his weight on her, and she couldn't help but feel a thrill run through her body. He opened the bottle and poured some of the oil onto his hands. He rubbed them together, warming it up before he started massaging her shoulders.
His fingers dug into her muscles, and she let out a moan. It felt so good, and she couldn't help but relax under his touch. He worked his way down her sides, his fingers tracing every curve and contour of her body. She was lost in the sensation, and she barely even noticed when he slipped his hand under her bra, cupping her breast.
She gasped as he pinched her nipple, rolling it between his fingers. She arched her back, pressing her breast further into his hand. He leaned down, his lips brushing against her ear. Her breasts were perfect, round and firm, with pink nipples that were already hard with desire. Her eyes were half-closed with pleasure, and he could see the flush spreading across her chest and neck.
"Do you like that, Amelia?" he whispered.

Her heart jumped at the use of her full name. She nodded. She was beyond words, lost in the sensation of his touch. He continued to massage her breast, his fingers teasing her nipple. She could feel her body responding, her pussy growing wet with desire.
He moved down her body, his lips trailing kisses down her stomach. He reached the waistband of her pale blue knickers, and she held her breath as he slowly pulled them down. She was completely exposed to him now, and she couldn't help but feel a sense of vulnerability.
He moved between her legs, his fingers tracing the outline of her pussy. She was wet, and she could feel her juices dripping down her thighs. He leaned in and inhaled her scent, before running his tongue up her slit. Amy moaned, her legs trembling. She moaned as he explored her folds, his tongue teasing her clit.
She was on the brink of an orgasm when he stopped. She looked at him, her eyes pleading for more. He smiled, his fingers tracing the outline of her pussy once more.
"Not yet, Amelia Pond. I want to make this last."
He climbed off the bed and stood next to it. He reached out, his fingers tracing the outline of her body. She was still tied up, completely at his mercy. He leaned down, his lips brushing against hers.
He moved away once more. When he returned, he had a blindfold in his hand.
"What's that for?" she asked, her voice trembling.
"It's for the surprise," he said with a wicked smile.
He tied the blindfold around her eyes, plunging her into darkness. She couldn't see anything, but she could feel his presence next to her. She could feel his breath against her cheek, his fingers teasingly stroking her body with such a light touch.
She jumped as she felt something cold and metallic against her skin. It was a vibrator, and he was using it to tease her nipples. She moaned as he traced it over her body, the ticklish buzzing taunting her.
She could feel her orgasm building, her body trembling with desire. She was on the brink when he stopped again. She let out a frustrated moan, her body begging for release.
The Doctor then reached down and untied Amy's hands, before turning her over onto her back. He then climbed onto the bed, positioning himself between her legs. He leaned down and started to kiss her legs, starting at her ankles and working his way up. Amy moaned, her body trembling with pleasure.
The Doctor then reached down and spread Amy's legs wider, before leaning in and licking her pussy. Amy cried out, her body shaking with pleasure. Blindfolded and warmed up by the vibrator, she was even more receptive this time. The Doctor then started to suck on her clit, before sliding a finger inside her. Amy's cries got louder and louder, her body shaking with pleasure.
The Doctor then started to fuck Amy with his fingers, moving them in and out of her at a steady pace. Amy's cries turned into moans, her body shaking with pleasure. The Doctor leaned down and started to kiss her, their tongues intertwining as he continued to fuck her with his fingers.
Amy's body tensed up, her moans getting louder and louder. The Doctor could feel her pussy clenching around his fingers, before she cried out and her body shook with pleasure. The Doctor continued to fuck her with his fingers, feeling her pussy clenching around them as she came.
The Doctor then pulled out his fingers and climbed off the bed, before turning around and looking at Amy. She was lying there, her body covered in a sheen of sweat, her chest heaving with each breath. The Doctor smiled and leaned down, kissing her gently on the lips.

The Doctor sat down on the edge of the bed, and then he pulled Amy over his lap. She squirmed, her heart pounding in her chest as she felt his hand on her ass. He rubbed her cheeks gently, and then he lifted his hand and brought it down with a loud smack.
Amy yelped, her whole body tensing up. It stung, but it also felt… good. She couldn't explain it, but she found herself wanting more. The Doctor must have sensed her need, because he started spanking her in earnest, his hand coming down again and again.
She moaned, her hips moving in time with each smack. She was so lost in the sensation that she didn't even notice when the Doctor stopped spanking her and started rubbing her ass instead. She sighed in contentment, her whole body relaxed.
"Good girl," the Doctor murmured, his hand still rubbing her ass. She blushed, feeling incredibly vulnerable but also incredibly turned on. She had never felt this kind of arousal before, and she didn't know if she could take it much longer. Finally he removed the blindfold.

The Doctor smiled as he positioned himself between her legs. He rubbed the head of his cock against her wet pussy, teasing her before he finally pushed inside her.
Amy moaned as The Doctor filled her. It felt amazing to have him inside her, to feel his cock moving in and out of her. She closed her eyes and let the pleasure wash over her as The Doctor began to fuck her harder and faster.
The Doctor leaned down and began to kiss Amy again, their tongues exploring each other's mouths as they fucked. Amy moaned into his mouth as she felt herself getting closer and closer to orgasm.
Finally, with a loud moan, Amy came, her pussy clenching around The Doctor's cock as wave after wave of pleasure washed over her. The Doctor continued to fuck her, drawing out her orgasm until he too came, filling her with his hot cum.
The Doctor collapsed on top of Amy, both of them panting and covered in sweat. They lay there for a few moments, basking in the afterglow of their orgasms.
"I hope you enjoyed that, Amy," he said, his voice playful and teasing.
Amy smiled and opened her eyes, looking up at him.
"Fuck, yes, Doctor," she said, her thick Scottish voice barely above a whisper.

Amy snuggled against him, her head on his chest. She felt content and satisfied, but there was still a spark of desire in her belly. She looked up at the Doctor, her eyes shining with mischief. "Again?" she asked, her voice husky with desire.
The Doctor grinned. "As many times as you want, Amelia Pond," he said, before capturing her lips in a deep, passionate kiss.
The Doctor smiled and leaned down, kissing her again. And as they lay there, entwined in each other's arms, the TARDIS whirred and hummed around them, taking them on their next adventure through time and space.