Love story about female best friend who his parents adopted

[Liebesbuch]

Looking for a love story that has multiple chapters. It should be in Interacial, Romance, First Time or Erotic Coupling. The premise is that a man and woman were raised together; she was adopted by his family as a child; they were best friends in school before then; they go off to college (separate schools); come back together and fall in love. Some other details I remember: she’s in track, he’s in swimming, they get caught before telling... I think their names are Sam and Emma. Thank you for your help!! I can’t remember the title and I’d like to reread this story.