The most obvious motivation given what we know about Quirrelmort and what he needs to regain his old power is that he retrieved her for use in the spell that will restore his body. For his motive to be anything else would constitute a twist.
The most obvious motivation given what we know about Quirrelmort and what he needs to regain his old power is that he retrieved her for use in the spell that will restore his body. For his motive to be anything else would constitute a twist.