Can you help me track down a short sci-fi erotica?

Hi all,
Years ago I read an erotica short story and I’m trying desperately to track it down.
I think I found it on tumblr but it may have been here on reddit.
Plot: A woman is aboard an alien spacecraft traveling through space. The ship itself seems to be alive, and it morphs itself into different shapes and begins to penetrate her.
Sorry I don’t have more to go on. It’s a pretty short story but that concept of the alien being the ship stood out to me.