I apologize for the lack of key identifiers. I read this story about 3 years ago and can’t remember the website, author, or character names. I do remember some key details about the story. The main character is a woman who is a marine guard on a space station I believe and her new shift partner just transferred in. She is disappointed that he is an alien and not a human because she hadn’t had sex in a long time. They get acquainted and eventually have sex. They can’t have penetrative sex because his cock is super long (his race’s female reproductive organs are way up in their chest or something) but he does have sort of an outward protrusion on his chest that he uses as a dick. Also the woman was freaked out by his macro sperm or something. Really want to read this again. Please help.
Source: reddit.com/r/eroticliterature/comments/6lxnxn/need_help_finding_a_sci_fi_erotic_story
I can’t help with this specific story, but there is a vaguely similar series called “Three Square Meals” on Literotica. It’s an amazing, very, very long series that is still being updated. If you haven’t yet, I’d definitely give it a read.
I remember this. She started having sex with his umbilical cord which his species keeps to honor their mothers. Sadly, that’s all I’ve got.