Transfer Clash of Clans account from one G+ to another G+ account?
You cannot directly transfer your Clash of Clans account to a different G+ account without contacting Clash of Clan's support (not sure if they would even let you do this).
Note: It is illegal per their Terms of Service to buy, sell, or trade villages.
If you want that person to have access to your village, I would recommend dedicating a device of theirs to just your account.