@SavingPrivateRightHand: You're assuming that the shaman
likes/will
like experiencing those feelings. It's all too possible that she is/will be
repulsed by them.
@Tamerlane: Actually, I think her possession went beyond merely the body and into controlling Leo's "mind", so that now she does have all that experience and skill at her command.
... Of course, I'm half-expecting that the sight of Fooly bleeding to seeming death will evoke such despair and rage in Leo that she'll overpower the possession on her own in the next chapter.