I think you're misrepresenting your fetish to them. I think you're making it sound like something terrible. You try to present it as something excellent, but do not overdo it. I also love women's legs very much, and my girlfriend does not mistreat them. But I can advise you a good site where you can admire women's legs (https://sexyfeet.org/video/girl-with-sexy-feet-walks-in-high-heels-shows-her-toes-and-soles/ ). My girlfriend knows that I look at other people's legs there, and she does not like it. Try not to tell your future girlfriend something about this immediately and gently stroke her legs.