Fics like Academic Investigations

Rean and Alisa's happy life together is disrupted by a very unusual phenomenon - Rean's demonic powers keep re-manifesting during sex, always resulting in all-night primal sexual marathons. Alisa's perfectly happy with that, but Rean insists on having it investigated. Emma agrees to help her friends out...but finds that her academic professionalism quickly begins to waver when presented with the chance to join in.

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