If my significant other and I trade iClouds, will we be able to receive each other's iMessages?

Okay so I'm leaving to college soon, and I have a girlfriend at home. Her crazy *** untrusting girl friends gave her the idea to track me at all times and trade iMessage accounts. We both have iPhone 6's. I just want to know that if I log into her iCloud on my phone, and she logs into mine in her, will we receive eachothers iMessages? Also is there a way to receive both mine and hers without have to log on and off all the time? And lastly, when I log into iMessage on my iPad I automatically receive a bunch of messages my phone has already received. Will that happen when we switch iClouds?

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