Additional: Dream is insatiable.

Horror will struggle if this happens, because having Dust needy and begging, pleading with him to "breed me! Breed me, Horror!"
It will be so, so difficult to hold back.

Same goes for hybrids. So Cross won't escape it, but he already wants faerlings, so he'll be all too eager to give Dream many of them.

Example: If there's too few summer fairies, then Dream will release the needed perhomone to trigger a heat in all mated summer fairies. So, if Dust were to just get a tiny whiff of it, then he'll suddenly be desperate to have a faerling with Horror. 😌✨