She knows when you're getting laid.
Fluttershy's cottage in my Equestria dreamscape is located on the outskirts of Ponyville at the edge of the Everfree Forest. So it's a rather secluded and private place. Far away from other ponies homesteads. So that evening nopony dropped by to disturb the two mares as they spent the night explored what this new aspect of their relationship meant.
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However….Even though Petina is half way across Equestria in Ft. Trotterdale her very reliable laid-ar >2974880 talent went off alerting her of carnal activity amongst her friends back home.