Portal pussy scenarios I feel always focus on sex from afar, which is good, but imaging the alternative.
The sub being given the fleshlight that leads to their own pussy, and being instructed to jerk the dom off with it. Having the kneel in front of them, pushing the "toy" down onto their cock, while feeling themselves be penetrated for every inch they bring the sleeve down.
At some point they would stop stroking, just wanting to swing their hips, so needy. But that wouldn't do anything. The only way they could continue getting off would be to continue the vaginal handjob they were giving their master.
This would even allow for never before possible possitions, like when the dom is about to cum they have the sub start sucking the balls, to make sure the biggest and creamiest load can be shot into their cunt.
And at the end you get the fun game where the sub has to decide who gets to hold onto the fleshlight. If it's left with the dom they will have no control over when or how they are used, but maybe that's what they want.
