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The Doctor had no idea how he had managed to get trapped in time just before Jesus was crucified, but somehow he was here. The Doctor found himself inside a tiny shack filled with woodworking tools and a huge, heavy cross filling most of the room. Now the Doctor has been alone following the removal of his last lover from the universe and so he had certain urges that had begun to well up within him. One such urge was the desire to place himself on the cross and have his way with it.
The Doctor had his fair share of sexual experience, including with crosses, but the St Andrews cross had involved a sexy Timelord whipping him until he came. But the Master had been gone for a long time, and he'd not fucked a human companion in so long that he was beginning to wonder what was wrong with him, but as he stripped his pants off and climbed to straddle the cross, he knew he wasn't completely broken.
He didn't quite know at what point his cock got hard enough to drip onto the wood, but as he braced himself with his feet, grinding his cock down on the smooth wood, the slide was easy. It didn't take long before he was fucking down onto the cross in earnest, wishing he'd found it after they'd stuck the nails in.
As his thrusts grew faster a spike of pain hit the Doctor right before he hit climax, it pushed him over the edge and he came covering the body of the cross with the pleasure of sin. As he looked down he realized that his cock was sluggishly bleeding from what looked like a rather nasty splinter, pulling it out blood continued to splatter over the cross joining his cum. Climbing off satisfied, the Doctor viewed the cross and admired that he had truly ordained the cross with his blood, sweat, and cum. He could barely hold back the excitement of what was soon to come, his cock filling steadily back up with blood at the thought of who was soon to come in contact with his sin. He came one last time near the head of the cross, before leaving the small shack to begin his adventure.