Hermione

Who better than his best friend, and the smartest muggle-born student in the school? It didn't hurt that she wasn't bad to look at, either - After puberty she had filled in quite nicely, with moderate sized breasts and a gorgeous ass. The way her hair framed her face was also enticing, as it gave her the innocent look that was just begging for someone to spoil it.

Harry took a discrete look back at the paper with the spell's incantation on it before deciding to give it a shot, his wand subtly aimed under the table to connect with his bushy-haired friend.

"Imperiolioum Maxima," Harry intoned under his breath, which drew odd looks from both Ron and Hermione, before the latter abruptly stiffened as the spell connected.

"Are you alright Hermione?" Ron asked curiously, before being distracted by the appearance of food. Harry watched with a bemused smile on his face as Ron instantly turned and began heaping food onto his plate, completely forgetting that he had ever asked a question.

Harry's smile turned predatory as he turned towards his best friend.

"Hermione, what's the answer to the third question McGonagall assigned as homework last week?" He asked quietly, testing the spell. When Hermione began quickly rattling off the answer, rather than berating him for not doing the work himself, the spell was confirmed as a success.

His success under his belt, he smirked. Time for the real fun to begin.