True love drives one to do things only a madman would.
It was a meeting of two innocent souls betwixt the soothing caress of romance and the tension of concupiscence. Two mollies, one fierce and gnarled on the inside, yet still warm and caring, and the other dainty and bashful, although with a fearsome aspect if provoked. It was apparent as soon as they met that they were meant for each other, in one perfect pair, one that, for their species, was guaranteed to grant them immortality so long as they procreated. They fell deep into love like a piscina meant for royalty, and it seemed as if they could never pull themselves back up to even the surface of the water.
They would embrace each other every time they got the chance. One molly's touch was broken, calloused, but gentle, whereas the other's was soft yet tight. They fit into each other like the most elegant tessellation. It was flawless. Almost too flawless to be the truth.
One night, an oracle stumbled over to the two, shaken by a recent vision, and told them that they would never be able to bear any young. It was not in the way that they weren't able to reproduce. Moreso, it was in the way that if they did, it would bring about nothing but destruction, perhaps even the rapture itself. The first molly, rougher around the edges, listened accordingly, although he was quite hurt by the notion. But his mate couldn't believe it. She wouldn't believe it. She reacted only with fury and disbelief. She swore at the oracle and insisted that his omen was a fabrication, that her and her mate would produce offspring, and that one of her children would grow up to murder him.
The two had their offspring eventually. That was when the softer molly would realize that she was only correct about the latter two concepts. By then, everyone knew of what the oracle said, and had set out to kill her children. And quickly, it drove her to paranoia. She became a frothing, hissing mess, snarling at whoever even so much as brushed against the fur of her young. Her mate eventually made the decision to send them away to somewhere else in time and space, for their own safety. By the time she realized it, it was already too late. They'd been gone for numerous mooncycles at that point in time.
True love drives one to do things only a madman would.
What that molly felt for her children was true love. And it drove her to do something unspeakable.
After all, poisoning your mate is typically quite frowned upon, is it not?