Those fingers were sending decided messages of pleasure to Harry's brain, and he almost frantically thrust against them, as if to impale them farther. He didn't care if he was giving Draco fuel for his superiority complex, this felt too good to worry about that. He was fairly riding those fingers though, moans cascasing from his lips....
...and then suddenly he felt something, as if Draco had touched something inside, and his moan became a shriek of pure pleasure.