Half Blood Prince(HBP) is the 6th book in the "Harry Potter" series. It is the second to the last, and by far has made a bigger scene then the previous ones.

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Severus Snape, former Head of Slytherin House at Hogwarts School of Witchcraft and Wizardry

The Half Blood Prince is a former student at Hogwarts who has written his methods in a potions book which falls into the hands of Harry. It teaches him spells such as Sectumsempra, and methods such as the bezoar antidote.

Your member, engorged with blood when you look at the curves of the now-legal Hermione.

The Half-Blood Prince (HPB) is:

1) The sixth of seven planned installments in the Harry Potter series of books.
2) A character in the Harry Potter universe.

A semi-boner; a penis that is engulfed with half of the blood required for a complete erection.