This sounds very familiar to me as well, however I’m at a loss for what it would be called or even if it’s the same fic. (Been reading wolfstar smut for over a decade now tbh!) Followers, any help? If you know that website you usually use, always a good idea to filter through what you know. By ship, then rating, or maybe even genre or tags (though last time I checked fanfiction.net still doesn’t have tags the same way AO3 does). Hope you find it!