Is it normal i love being suffocated

Well I know I'm not normal and it's a fetish but how normal is it? I love the idea of being tied up and suffocated. Ideally I would love to partner up with a beautiful woman who really enjoys doing it to me. I've fantasised about being tied up and suffocated till I pass out while the woman is moaning and groaning with pleasure about doing it. To freak things up a bit more I would still allow myself to be tied up and suffocated if she had a desire to roll play killing someone because it's something she wants to do.