Well this is an excellent start – make the most of the slippery bubbles and water like this:
Then hopefully you have a detachable showerhead so you can use it like this:
Of course, you’re just edging, so no cumming!
And for some, it’s a real turn on to imagine someone you fancy is secretly watching you…
If you’re lucky enough to own a suction cup dildo then this is one of the reasons they are so great: