I prefer role play that doesn't stray too far from what's actually happening, namely an encounter with a musclebound woman who's in control of the situation.
You pretend to walk in on her while she's flexing and she pretends to notice you after a while and turns around startled but then a mischevious glint comes into her eye as she realises you're no match for her and she wiggles a quad and pops a bicep saying "Do you really think you can handlle this?"
... OR ....
Pretend you're alone in a changing room and just got undressed, and she walks in with nothing but a towel over her shoulder. You tell her this is the men's room and she just licks her bicep while running a scornful eye over your body, maybe flashes her big clit if it's erect and replies "What are you doing here then?"
Either scenario can escalate with you pretending to go into dumb macho man mode and dismissing the evidence of your own eyes to tell her she's going to get her pretty little ass spanked red if she carries on like that and she's all "Come and get it then", challenging you to wrestle.
Now slightly nervous but feeling you've got little to lose either way from rolling around with a sexy woman, you accept her challenge and then she snaps on a latex glove while looking you in the eye and says "Tell you what big boy, loser gets fingered"
If you've picked on a suitably big woman, the subsequent wrestling and humiliation would be for real ...