Sappho's Sisters — Berengaria Brown

Lady Eustacia Lumley is the only child of the Earl of Wentworth. It's her duty to marry well and ensure the succession.
Margaret Durrell is the fourth daughter of a gently born, but near penniless Vicar. She has no option but to marry a man who can provide for her and possibly for some of her sisters as well.
Both young women are very interested in Sappho's poetry and ideas. One evening, Margaret has a headache and Eustacia offers to massage her scalp. This leads to sex, and Margaret's very first orgasm.
They fall deeply in love, but is there any hope for them? Or will they both have to conform to the rigid rules of Regency society?