Loaning, and sharing accounts is strictly forbidden.
Accounts are the property of Ankama. Players are simply title-holders, which is to say that they enjoy the benefits of access to the game and Ankama services, through the intermediary, which is an account at their disposal.
The user agrees not to provide access to their account; loaning, sharing, exchanging, gifting, purchasing and selling accounts is therefore forbidden.
If you've loaned an account to a friend, you have, in doing so, broken the rules. Ankama reserves the right to temporarily or definitively suspend access to the account, without compensation.