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In the graveyard in the Goblet of Fire, Voldemort was able to freely touch Harry without harm once he possessed Harry's blood (which contained Lily's sacrificial protection).
Why?
Voldemort was still Voldemort, he was still evil and malicious, even if the blood he possessed was not his own. Shouldn't Harry's blood have recognized that? What are the specific mechanics of the situation?
Harry's blood contains the love from Lily's sacrifice. Even though Voldemort is so full of hatred he can't possess Harry who's full of love, the small amount of love that went into Voldemort through Harry's blood was enough for Voldemort to touch Harry.
"Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. He didn't realize that love as powerful as your mother's for you leaves its own mark. Not a scar, no visible sign... to have been loved so deeply, even though the person who loved us is gone, will give us some protection forever. It is in your very skin. Quirrell, full of hatred, greed, and ambition, sharing his soul with Voldemort, could not touch you for this reason. It was agony to touch a person marked by something so good."
The fact that Voldemort can't touch Harry and the fact that he can't kill Harry are to different things: Voldemort can't touch Harry because he is full of hatred and Harry is full of love, and he can't kill Harry because of the sacrifice protection on Harry. Voldemort basically put a bit of love inside him so he'll be able to touch Harry.
