The College Secrets Series
The books in the College Secrets Series are novel-length stories of 50,000 words or more. They focus on the relationship between one woman and (usually) one man. They take place on and around the fictional college campus of Oaklun University. These stories always have a HEA (happily ever after) ending and feature fast, intense romances, though not quite of the "insta-love" variety. Common themes include age differences, both older man and older woman. These might be student-professor relationships, sexual awakenings, or other things you'd expect (or not) to find in a college town.
Each of these books can be read as a standalone title. However, later books focus on characters that are first encountered in previous titles. If you plan to read all of them, you should definitely read them in chronological order.