So this time around it's telepathy. Similar to when their deepest desires were unleashed, this time around, their darkest secrets get revealed. Again, it's based on the current situation with the telepathy revealing what the character is really thinking at that time. Getting kissed on the cheek by your cute sister calls for celebration. However, unlike their desires, at times they willed their thoughts to be sent to others. At this point, Heartseed's claim that the events are random is probably wrong. It might have been random, but probability supports Heartseed interfering. While the characters obviously haven't noticed, Heartseed is there to help them though each of the phenomenon and so leaving it to random events does not sound like the smartest option.
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