This is a difficult one since the very act of submission especially male/dom fem/sub requires a fair amount of trust, for very good reason. Anyone with whom I have crossed this threshold with has taken time and connecting in order to go there. It is a very YMMV activity and I would be reluctant to recommend anyone without their consent or knowing you.
That being said there are occasionally ladies who advertise submission in the kinks fetish’s section of LL.
Good luck.