The subscription is tied to the App Store / Google account of the payer, and the rights belong to them. If you are the payer: even if you disconnect from your partner, you keep your privileges until the end of the paid period; you can switch to an Individual Account and use it alone, or pair with a new partner and continue. If you are the partner: your account automatically drops to the Starter plan the moment the connection is broken. If the payer pairs with a new partner, the plan's remaining days and features are instantly transferred to the new partner.