Naruto starts to win

Naruto tried to match her bouncing as she took him deep and hard into her. But they both growled and grabbed each other. Tsume grabbed his hair and bit his neck while he grabbed her thighs and made her spread wider. Both of their hips smacking so hard Kushina felt like she'd be deafened.

But it was clear Naruto was winning, Tsume was falling out of rhythm and panting harder, Naruto thrusting steadily faster. SMACKing her ass Naruto kissed her, making her eyes roll back, and she started to cum.

It was her loss, she acknowledged that. Cumming that hard, that quick, unless his massive balls just were empty for some reason he'd outlast her.

However she was going to make him work for it!