my weird kink

i've been struggling w this weird fetish for years now. i love watching my partner being submissive to a total stranger, but it has to be someone who doesn't know us at all. the idea of them not knowing our secret makes me hot. i set up these webcam sessions where he chats with random dudes and pretends we're just friends, while i hide in another room and watch him get into it. sometimes i join in too, touching myself as they talk dirty to him. i've never done anything live or shared videos, but the fantasy is so intense. is this normal? should i tell my partner how much i secretly enjoy it?