My Sister, My Beloved by Edwina Mark 1955, Paperback
Half-sisters--only half-sisters, but one is pregnant.... Excerpt: Sheila climbed in carefully, I turned around. Her nightdress had caught in the sheets and had hiked itself up. She put her arms around me and held me tight, I could feel her burning body pressed against mine; her thighs were like two flames against my legs.
CONDITION: Good. Slight foxing on bottom of spine. Spine glue darkening, loosening on edge of front cover.