Aggressively

While caught off guard initially from the shy Hyuga kissing him Naruto didn't have any hesitation returning the favor in a much more ferocious fashion. Naruto grasped the back of her head and increased the intensity of the kiss catching Hinata off guard. They continued this for a few minutes before Naruto felt his lower half start responding and brushing against the clothed Hyuga's leg. Hinata feeling something brushing against her leg could make some assumptions for what it was. However, her eyes still went wide with what she seen when she looked down.