Ben held the twenty gauge, one and a half inch long needle just above Beth's soft smooth bottom and rested the tip of it against her skin so that Beth could just feel the sharpness without it piercing her skin yet.

As she counted down, her voice was clearly marked with nervous apprehension but Ben could still detect an edge of arousal by the huskiness in her tone.

As soon as she reached Zero, Ben quickly raised the syringe and jabbed it deeply into her muscle, the hub of the needle making contact with her skin. There wasn't time to depress the plunger so Ben supported the needle, holding it steady with his gloved hands, the needle deeply embedded in her flesh whilst once again, Beth began her count down to Zero.

Beth whimpered softly as she lay there, feeling just the sting of the needle in her butt but as the two conflicting sensations of the probes and the shot merged, she realised it felt good. Then, the pleasure of another contraction hit her and once again and she began her count down.

"Five, four, three, two, one...."

Zero. As Ben quickly aspirated and pushed the plunger down, Beth made a loud panting sound and moaned as he swiftly unloaded a stinging dose of hepatitis A vaccine deeply into her muscle. As the pain mingled with the pleasure she felt from the probes, Beth was surprised to find she actually began to enjoy it.

Ben continued working through this process of injecting only when Beth gave him the signal and in addition to the hepatitis A, Beth received a further eight injections. All were given very deeply into her bottom.

Diphtheria, poliomyelitis, hepatitis B, tetanus, rabies, typhoid, cholera. Beth's bottom was now very swollen and sore, covered with multiple injection sites.

The last injection Ben had to give was Japanese encephalitis and it would be the most painful of all of them.