Removing a device from your account

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http://androidforums.com – I own a Motorola Atrix 4g and a Nexus 7. I bought the Nexus 7 first and was very happy with it, and bought the Atrix as just something that I could use while I wasn't around the tablet. After using the phone for a while, I noticed that it has become easier for me to use than the tablet. My girlfriend likes the Nexus b/c of some of the games on it. I would like to deregister the tablet from my acct and just put hers on it, but I have read that the device will still show up on google play. My question is, is there any way for me to remove the tablet from my account. I know that I can do a fact (General)