One of my first MFF threesomes after my separation was with a younger couple, the lady was especially submissive and had zero gag reflex so could use her throat for FF very easily. I remember being impressed and trying out different methods to improve my head gameI was thinking of civvies too not just SPs.
I think the excitement is in the vibe of pleasing your partner and for a submissive there's another level you can go to called sub space. Just be careful initiating these activities as they normally require knowing your partner well to respect boundaries and time investments you might not be prepared to make as a client.
I no longer offer more than light submissive sessions after bad experiences including having the underside of my tongue ripped open when someone tried FF without proper communication and technique.
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