If your really starting to enjoy having your Hufflepuff companion around, come on! Stop calling them a companion and actually make em a friend. Take them to go get butterbeer on weekends, have them ride with you on the Hogwarts express, invite them over to your house but only If your parents are ok with it. If you don't think they will and haven't asked them, just ask! You'll never know if you don't ask. It could work, I mean, if you've read Parvati Riddle book 2, you can see, Voldemort let a Potter into the house, and nobody saw that coming. So it might work.