Floof's had a thing for being tentacle raped and laying eggs for a long time. Since she was a little boy in fact!

It all started when he went on a trip with 4 of his friends and got their picture taken.
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Little did they know, the nature preserve they went to had an endangered species of tentacles!
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When it implanted the egg in Floofy, he was very upset, partly cause he enjoyed it. He sought help from parks administration. Well they said they wouldn't remove it, endangered species and all. Especially since this species was very picky about it's egg's host.

Try as he might, he couldn't fight the rising enjoyment he got from carrying the egg. Nor the pleasure from the aphrodisiac slime that the egg slowly released.

Finally, when floofy laid the egg, it left him feeling empty. Mostly physically but a part of him wanted to carry more eggs...

And so he sought more eggs to carry or lay. He met a very nice magical jackalope that helped him with exactly that! This just opened the doorway to his true addiction to eggs.
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Sometime after, he was captured and subjected to tentacle rape again, reminding him that he liked more than just carrying the eggs. He also liked having control of the situation wrested away from him. Also tentacles.
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Magic struck! Turning floofy into a girl! Lucky little... boy? Or would it be girl? Either way, lucky little boy/girl!
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Turns out some tentacles are sexist bastards, only laying their eggs in females. Thus lucky Floofy, she suddenly found it easier to get implanted with eggs.
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It wasn't all pleasure. Sometimes the eggs were large enough to really hurt. The struggling against the pain made the lack of control feel all the more authentic, thus heightening the pleasure of it all. And the feeling of violation that stuck with her (which made it [i]even more[/i] enjoyable).
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Laying the eggs always gives her the most orgasms. The best ones are where she feels she was truely forced into it and violated, the painful ones that she struggled against. But she always enjoyed the laying!
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The the most recent one was just pure agony. Sure the rape was pleasurable, but its 'egg' was different. Rather than just laying it sometime later, she had a week of the most agonizing cramps in her life. Followed by a bloody laying of a marble sized 'egg'

As it turn out, this species of tentacles doesn't implant an [i]egg[/i], it implants an [i]ovary[/i]. Which will tear out one of the hosts ovum and take its place! 

Floofs ovulation cycle alternates between her normal ovary and the tentacle ovary.

The cycle for her normal ovary is rather uneventful, ending after a month with mild cramps and almost no blood during her period.

The cycle for her tentacle ovary starts with a sudden increase in hunger. The egg grows rapidly, with a visible bulge just 2 weeks after her last period and continues growing until 7 weeks in. The cravings start about 1 week in, mostly for jello and seaweed. About 6 weeks in she starts lactating.

Finally, at 7 weeks in, it stoped growing and starts developing it's shell. At 8 weeks in it's time to lay the egg. At this point it's wider than Floofs head at it's smallest point, and hard as stone.

The laying is agonizing, essentially giving birth to an infant sized stone every 3 months. Each time she starts showing a bulge, Floofy feels like she's been violated all over again. And it thrills hers... until the agony of laying starts.

Regardless, she swears off tentacles forever! Or, well she tried, but she gets drawn back after less than a year.

A few years in the future she comes upon a male of the same species of tentacle... and learns the hard that they implant testicles with the same method. Suffering utter agony as the testicle takes the place of her remaing natural ovary, thus turning her into a literal tentacle breeding machine for the rest of her life.