Stepping on his dick!

Erza smirked, just a tad sadistically as she Requipped another enchanted rope, and yeeted it at Natsu, which made him yelp as it moved independently of her hands and hogtied him, and left him laying on the floor. "...how many of those did Lucy give you with the outfits?" he whimpered, blushing heavily.

"Yes," Erza replied, making Natsu freeze at the implications of THAT particular answer. Erza then used a foot to flip him over, and raised it back up, and placed it right on his manhood. Then she started stroking it with her boot, and causing him to moan.

"...unh..." he groaned, his erection growing hard. It was weird, actually having the ability to get turned on by this. It certainly had the advantage of mixing things up a bit.

"So, do you like that?" Erza teased him, and he bit his lip and nodded.

"Yes, Mistress Erza..." he moaned as she kept stroking his shaft with her foot.

"Good... that's right, if you want me to be your bitch from time to time, you also gotta be mine from time to time. It's only fair, right?" she asked the artifically made switch.

He nodded in agreement. "Yeah, that is fair..." he panted out, his cock throbbing. He actually didn't mind this arrangement. It certainly created more of a sense of equality between them, knowing that he could dominate her, and she could dominate him in return.

Before he came though, Erza applied pressure to his cock, and essentially pinched it off, and he yelped in discomfort. "Did I say you could cum, bitch?" she asked him.

He bit his lip and shook his head. "No... Mistress Erza..." he whined as his pleasure receded from climax. Erza smirked and resumed her dominant actions.