Yaz lay in her bed on the Tardis, dressed in only her underwear. Black panties with a black sports bra clung tightly to her smooth brown skin. She couldn't sleep. Her mind was racing, filled with thoughts of the beautiful blonde Time Lord she travelled with.

She heard a soft knock on her door. Yaz got up to open it, and to her surprise, it was the Doctor. "Hey, I couldn't sleep. Thought I'd come say hi," the Doctor said with a smile. The Time Lord was fully dressed as always, complete with long grey coat.

Yaz couldn't believe it. The Doctor never came to her room. She stepped aside to let the Doctor in, and as she did, the Doctor's eyes scanned Yaz's body.

"You look... nice," the Doctor said, her northern accent thickening with what sounded very much like desire.

Yaz felt a shiver run down her spine. She'd forgotten her state of undress. She tried to cover herself up and the Doctor laughed. "Sorry," Yaz was blushing bright red, "I'll put on-" The Doctor pressed a finger to her companion's lips, cutting her off. "Don't be silly, Yaz," she said, cupping her cheek and stroking gently with her thumb.

Yaz couldn't believe what was happening. The Doctor walked over to Yaz's bed and sat down, patting the spot next to her. Yaz sat down, her heart racing. She could feel the Doctor's gaze on her, and it was making her feel self-conscious but also incredibly turned on.

Suddenly, the Doctor reached out and grabbed Yaz's wrists, pulling them together. Yaz gasped as the Doctor tied her wrists together with a belt. "What are you doing?" Yaz asked, her voice trembling.

"I'm going to show you something amazing," the Doctor said, her voice filled with excitement, "that is why you travel with me isn't it?" Yaz swallowed hard then nodded. "Good, we're on the same page then," the Doctor smiled. Then the Doctor kissed her. Hard.

Yaz moaned into the kiss as the Doctor pressed her down onto her back. She pinned Yaz's bound wrists above her head and trailed her soft fingers down the young muslim's arms and shoulders. Then she stepped back.

Yaz watched as the Doctor stripped off, shedding her coat then her braces then her shirt and trousers. The Doctor winked as she unhooked her bra and peeled it away, then shimmied her underwear down and off. The Doctor stood before her naked apart from bright blue socks.

Yaz whimpered as the Doctor straddled her waist and grasped her boobs. The Doctor grinned, feeling her breasts rise and fall. "Doctor," she gasped as the blonde squeezed tightly then kneaded her modest tits into her chest, before pumping them up and down.

With a rip, she tore off Yaz's bra and made her yelp as she pinched her nipples. Then she traced kisses down her chest and stomach, her tongue slipping into Yaz's navel to make the dark-haired girl squirm. The Doctor looked up at Yaz mischievously, then lashed her tongue against Yaz's thin and rapidly wettening underwear. Yaz groaned and gasped with pleasure.

Then The Doctor was on her feet again. The Doctor spun Yaz onto her front playfully, smacking her on the ass with a chuckle as Yaz yelped in surprise. Then she darted away. Yaz struggled against the belt binding her wrists without result, watching helplessly as the Doctor retrieved her coat and forraged in the pockets.

"Are you at least going to take your socks off?" Yaz called to her. The Doctor gave her a playful scowl while slipping her coat back to create a bizarre near-nude ensemble. "Don't make me gag you, Yasmin Khan," she warned. Then she chortled with joy as she found what she was looking for. Yaz's eyes shot wide open as the Doctor produced a huge strap-on dildo.

The Doctor grasped Yaz's sides tightly and pulled her up on her knees, slapping her ass again as she did. Then she buried her hand in Yaz's dark hair, pushing her face down on the soft bedsheets with her arms stretched out above her head, her ass up in the air for the taking.
The Doctor started grinding against Yaz, the dildo pressing against her underwear. Yaz moaned as she felt the pleasure building inside of her.

"Do you like that?" the Doctor asked, her voice husky.

Yaz could only nod, her mind reeling from the sensation. The Doctor continued to grind against her, building up the pleasure until Yaz was on the brink of orgasm.

And then, suddenly, the Doctor stopped. Yaz looked up at her in confusion and disappointment, but the Doctor just smiled.

She reached down and pulled Yaz's underwear to the side, exposing her pussy. Yaz gasped as the Doctor leaned down and started to lick and suck on her clit.

Yaz's hips bucked as the Doctor's tongue worked its magic. She felt herself getting closer and closer to orgasm, but the Doctor pulled away just before she reached the peak.
"Please," Yaz begged, her voice barely above a whisper.

The Doctor smiled and positioned the dildo at Yaz's entrance. She pushed inside, and Yaz cried out in pleasure.

The Doctor started to fuck Yaz, slowly at first, but then faster and harder. Yaz's wrists were still tied together, and she could only lay there and take it. The Doctor's hands were gripping her hips tightly, nails digging into her sides as her strap-on pounded into Yaz mercilessly.

She felt herself getting closer and closer to orgasm, and this time, the Doctor didn't stop. Yaz cried out as she came, her body shaking with pleasure.

The Doctor continued to fuck her, drawing out the pleasure until Yaz was begging her to stop. Finally, the Doctor relented and pulled out and collapsed next to Yaz, panting and sweating.
"Wow," Yaz said, her voice filled with awe.

The Doctor chuckled and untied Yaz's wrists. "I told you it would be amazing," she said. Yaz couldn't believe what had just happened.

The Doctor stood up and started to get dressed properly. "I should get going. Busy day tomorrow," she said. Yaz nodded, still in a daze. "Every day's a busy day," the Doctor smirked. The Doctor walked over to the door and turned around. "I'll see you tomorrow," she said with a wink.

And then she was gone.

Yaz lay in her bed, her body still tingling with pleasure. She couldn't believe what had just happened. The red marks on her wrists were the only proof in the morning anything had happened.

The Doctor piloted the Tardis without comment and their next adventure was like any other. But the next night… Well, Yaz realised the Doctor at night was a very different woman to the adventurer of the day when she showed up at her room again, this time with handcuffs…