Until they cum.

"Oh... So forceful..." Erza cooed as Natsu kept pounding into her.

"And you're so tight," Natsu grunted, keeping his grip on her wrists, just watching her breasts jiggle with every thrust. "I love this..."

"Oh, me too..." she gasped. "Harder, fuck me harder!" she begged him.

"As you wish!" he grunted, going as hard as he could manage with the position they were in. She bit her lip and closed her eyes, or rather, her visible eye at least.

"Natsu... If you keep this up, I'm going to... I'm going to..." she moaned out.

"Do it! Unh, cum for me Erza!" Natsu grunted as his dick throbbed.

"Ahhhhhhh!!!" she cried out, and arched her back as she spasmed from the orgasm. He followed suit by cumming as well, filling her wet snatch with his seed.

She panted, sweaty, and her tits heaving as he released her wrists, and moved into a sitting position. She sat next to him as she caught her breath. "Wow," he smiled.

"Indeed... That was amazing," she cooed.