He struggles

Now, Naruto was a bit of an idiot but even he knew this wasn't a normal exam. Whilst a part of him desperately wished otherwise, by this point he was fairly sure he was sucking on an actual, living cock belonging to Tsunade. He felt like he should freak out, but instead he was turned on at the thought of sucking her thick cock.

It was for that reason that he played along, running his tounge over the bottom of her cock, supressing the need to gag and trying to swallow her cock. He had never been so hard and he's already leaking pre cum

Tsunade for her part was shocked, the little slut was getting off on sucking her cock! He was rock hard and leaking whilst she fucked his pretty mouth. Fuck, she should have done this weeks ago!

Deciding that she was clearly being too gentle, she decided to up the ante. Getting a firm grip on his hair, she draw her hips back and slammed back into his mouth and throat, groaning in satisfaction, not even bothering to pretend anymore

Naruto choked and gagged on her fat cock, barely able to breath as his throat was pounded hard by his superior. All he could smell, all he could taste was her cock. He was bright red and drooling by this point, his poor little cock was just on the edge of erupting and he hadn't even touched it yet