An Expert Teacher by Penny Jordan (HP 1153)

Awesome!  They had a friendship when she was 14, him 20.  He taught her how to kiss when she asked.  Now at 24 she meets him again at a society wedding.  He thinks she thought he wasn't good enough for him.  He offers her a job.  They go away together and he tries to seduce her.  They end up in bed, he finds out she's a virgin, they have a post mortem on sex, he reveals he loves her, she reveals she loves him.  Yummy. 

Rating: 4/5 stars, a tad dated, but it's a wonderful story of discovering passion.