Hyrule0fFat:
I'm into doing clothed facesitting,but it is a bit nerve wracking. I get fears I'm going to accidently kill them lol. That's why I prefer to do it with someone I know well.
If your profile is (weight-wise) accurate you are not heavy enough to cause an issue to any one suggesting to have you face-sat. You may case some shortness of breath but it is a turn-on.
If you are that concern agree on a sign/code to allow you to move off then rapidly.