He hissed and growled in pleasure despite the pricking of her nails in his back. Yes. That was the good kind of pain that reflected just how far he'd pushed LUcy and that knowledge combined with her sudden tightness as Lucy's entire body locked up around him as she climaxed was exactly the final push Natsu needed to reach completion as well.

WIth one final thrust he pushed inside of Lucy as far as he could go before bursting and filling her core with his hot hot seed with a victorious roar of her name.