Fics like Set My Heart On Fire

Snape and Harry form a reluctant and volatile truce, and Snape joins Harry on the Horcrux hunt. They end up at the Ministry in the Department of Mysteries and find themselves in what turns out to be a Room of Fertility. The room plays merry havoc with their libidos and locks them inside until they do the deed on a stone altar. Which results in Harry becoming pregnant (due to very rare fertility magic), even though he doesn’t realise it for a while. Snape finds out right before Harry has to fight Voldemort.

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