One of the many reasons the Cutie Mark Crusaders have their reputation is the group's tendency to ignore whatever the adults are saying -- or worse, to hear just enough to get them in trouble. So when Cheerilee finally covers pony sexuality on a warm, lazy, sleepy day, the trio come away with exactly enough notes to collectively believe the following:
Ponies going into heat is real.
They'll never be interested in sex at any other time.
They're going into heat once, for an hour and a half, and it's going to happen tomorrow.
This can only end well.
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(Rated C for Crackfic.)