in a way john watson is a fantasy (what if you had this brilliant enigmatic friend and what if he liked you in particular and what if he offered you the excitement of youth and adventures and a way out of boring society life and all without having to actually give up your status as a gentleman so you could have the best of both worlds) and in a way sherlock holmes is a fantasy (what if someone never got tired of you despite your various strange habits and mood swings and instead of simply tolerating you they genuinely liked you and what if you didn’t have to live alone forever and what if you never had to give up doing the things you love) and of course there’s the most fantastical part of it all (what if you could afford london housing prices)
Well, famously they can't actually afford London housing, that's the whole reason they met.
