Musing because DS will be in this situation in the summer and he has asked me about it and I am not sure what to advise.
If you move in with someone who has recently bought a home should a) contribute on the basis that it is your home too and presumably you are not planning on splitting up? And if so, when do you insist that your name is on the deeds? Straight away, after a year, marriage? or b) pay your share of everything else but the mortgage on the basis that it is their asset and as you dont have a claim on it, why should you be helping to pay it off? or c) pay rent for the use of the house?
b) and c) would of course mean that you have no say at all over the house in anyway so it may not feel like home so personally I would want to go for a) but that is quite selfish.....!