‘We do not plan on getting married’: I’m moving into my boyfriend’s home. He bought it a year ago and paid off 25% of his mortgage. How do I get a stake in his home that’s fair to both of us?

My boyfriend and I would like to move in together in the next year or so. He bought his house about a year ago, and he has paid off about 25% of it. We both would like for me to gradually become a par...