She moved out of his arms and sat on the bed next to him.
And then she waited some more.
She made sure he was well and truly asleep before applying just a touch of telepathy to make sure he didn't wake up when she took his left arm and wrapped a strip of cloth just above the elbow joint. She kept that touch of telepathy there while she flicked the juncture until a vein stood out enough to be seen.
Then she brought the syringe out from where it was hidden in her body and pushed the sterile needle into that dark vein, pulling it back to get the needed blood. Once it was full, she removed it from his arm and pressed tightly with her free thumb. The hand becoming something like liquid as it wrapped completely around his arm to stop the bleeding while she grew another limb and took care of sealing the blood sample. The needle was removed from the syringe, a cap put on and the back broken off to seal it at both ends before it was hidden away inside her next to the semen sample.
The strip of maleable flesh around his arm became a hand once more and the third limb disappeared. She untied the strip of cloth from his arm, but kept her thumb pressed to the small wound. It took only a light brush of power to trick his body into feeling no pain from it. If he noticed it was bruised when he woke up, he would most likely associate it with her thumb digging into that spot all night as she held him to her.
Smiling contentedly, she got back under the covers and into his arms once more. She would get the hair sample later. She was pretty sure he'd let her trim his hair if she offered.
Sinister pulled her mind from Jack's when she was certain the bleeding had stopped and he no longer needed to be kept asleep.