I have two actually. The first one is That's What Friends Are For by lovecraft68 and, I dunno if you consider a web comic a suitable story but, Cheer by Foreview. I consider both to be good since they both focus on the characters besides the fun time and they both really focus on building them.
The warning for it being ongoing is because there is a lot to read and it's all good, the chapters are broken out into books, currently on the 7th I think. If you want a wrapped up ending you can always stop at the end of one of the books and wait for the current one to finish, but they all flow together so good luck stopping
Mine is Sandcastles by onehitwanda! I've read just about everything she has up there, but this was the first of hers I ever found and it's so sweet, it'll always be my favorite
There was one that I have since lost that was a femdom one. The woman had a fun habit of intentionally locking her boy toy in the lockers of a local pool. She'd do a little strip tease and then leave him there for hours while she was off doing whatever.
Plus some chastity cages were involved. I wish I still had it.
I'm reading Dungeon Builder's Harem because I like "isekai" stories generally. The story is interesting but there's way too much pointless sex and much more incest than I would like. I might give up on it.
Home for horny monsters, and the other tie-in series by writerannabelle. Monster girls, magic, and an actually really good story to go with it? Yes please. The main story and the tie-in story are both still ongoing, the main story is at 108 parts and the tie in is at 24, both are still ongoing. Best advice is to start at the beginning of the main story instead of picking a random/recent chapter