What happens when a student eavesdrops on a particularly tender moment between the resident Potions Master and the new Defense Professor?

A 21 or 22-year-old Professor Snape must, as Head of House, give a lecture on sex education to the fifth, sixth, and seventh year Slytherins. Unfortunately, some of them also witnessed his bullying at the hands of the Marauders . . .

A 21 or 22 year old Professor Snape must, as Head of House, teach sex education to the fifth, six, and seventh year Slytherins. Unfortunately, some of them witnessed his bullying at the hands of the Marauders . . .