Some ideas
Looking for a flirty dinner with the neighbor couple which quickly goes into wine, undressing, and sex. Or my girl is a live in nanny who is seduced by the wife then the husband. Or her best friend who is the bride, tricks her into sleeping in the same bed as the groom as a treat for him. Or my girl is sent to go live with friends of the family for the summer and help them out, and they help get her out of her shell and embrace her sexuality. Major themes of character growth, emotional growth, sex, virginity and deflowering, hesitancy becoming confidence over time, pregnancy risk, dub-con/non-con, kissing, fingering, oral, etc. Lots of romance, smut, emotion.