Suggestions:content for the female MC in its first position the P.O.V would be of the male spirits, however, if you do not want changes will have to find the strapon(big)for the MC and the (small) for the spirits.
Add scenes of play with breasts(groping,paisuri or sucking them{also applicable in the male MC and as suggestions to your partners}, also as a nursing handjob).
And why not add a section for secondary spirits as well as a perk to see them again and be able to interact like with urine and the others.