Rules
Harry must have been engaged to a charmed one
Harry must be one of the last wizards alive
Harry did not know the sisters had magic
Harry was kidnapped by a demon and experimented on to infuse demonic and/or wiccan magic with his, so the demon/ warlock could take his power
Harry still has his money and magical items from gringotts
None of the sisters die but Paige still joins them
What ever sister was engaged to Harry must still love him
Can be multi/harem
Can be godlike Harry/ charmed ones, but they must be challenged sometimes
Harry does not like the elders but can work with them
Must take place in the charmed universe