I thought of a few for you.
Lessons by Kim Pritekel with Alexa Hoffman
http://www.academyofbards.org/fanfic/k/ ... sons1.htmlSummer by Dee has a rich artist and a poor student/writer.
http://www.academyofbards.org/fanfic/d/dee_summer.htmlThere are 2 more that the protags have more years between them that I can't recall titles or authors.
One gal & mom of yet to be met love interest work together. The daughter is a twin and both are interested in women, but not out to their mom. One daughter is more rebellious and the other more perfect to the mom both are in some school. Drama angst & hijinx ensue.
The other story is shorter has teacher/soft ball coach and tomboyish high school girl. A sister to student is "perfect" example of femininity and mom is more interested in girl dating boys and being popular than her skills or happiness. Girl is moved to varsity SB from JV and all her supportive friends are in JV. Varsity is full of nasty clickee biatches who treat her badly & bait her and coach.
There are 3 books in print that are by Karin Kallenmaker that have significant age differences.
Touchwood, Watermark and Painted Moon
Kali