Penetrate her from behind

You hastily unbutton your pants and push down your underwear. Your cock is harder than you’re ever seen it before and absolutely pulsing with sheer animal lust.

“You can’t do that” the pinned Amazon says in a surprisingly level voice.

“Yeah, just watch me” you exclaim as you position yourself to thrust between her legs…

Without warning your penis suddenly deflates like a balloon that someone let the air out of. You make a strangled sound of frustration.

“I’m watching,” Wonder Woman states in a bemused tone, her head turned to face you. “Is this the part where I reassure you that 1 in 5 men…?”

“WHAT! THE! FUCK?!?!” you exclaim. The rest of your body is shuddering with urgent need, but somehow the sensation just stops at the base of your shaft.

“I said you can’t do that” the heroine explains, her tone patient but without a hint of sympathy. “That wasn’t a plea; it was a statement of fact. We made an agreement for oral sex. Intercourse would exceed the terms of that deal. Therefore you…” she looks down pointedly at your limp stick, “Can’t.”

You groan in agony; the worst case of blueballs in human history is setting in. “OK, OK! I get it! I got carried away! Sorry!” You make sure you’re still holding onto the end of the lasso. “Do something! You made an agreement too!”

She stands up calmly and half turns towards you, her regal bearing undiminished by her nudity. “Yes. And I know better than to try and fight the lasso.” She doesn’t add Unlike Some People, but it's there nonetheless. “Untie my hands, and let’s see how quickly we can get you fluffed so we can get this over with.”