Living Dolls by Marshall Ian Key
High school senior Jason Thompson finds two dolls that used to belong to his grandfather, and photographs showing his grandfather in bed with two very beautiful, very real women. When he finally learns his grandfather's secret, he finds a new world has opened. Not only can he transform the dolls into any woman he desires, but the women appear to find him incredibly attractive from the minute they arrive.
After a month, Jason finds that the dolls are much more than a potential source of celebrity threesomes. One of his teachers is horribly depressed. Can the dolls help him learn why, and possibly put her on the path to future happiness? One of his classmates seems locked in a cycle of trading one bad boyfriend for another. Can the dolls help Jason break up her current relationship, and show her the advantages of going out with one of Jason's best friends?
And finally, what about Jason himself? The new transfer student has turned down dates from every jock in school, and shows every sign of being as attracted to Jason as he is to her. But she turns him down as well, and Jason finds she has a mysterious secret of her own. Are the dolls just what Jason needs to unlock it and help them both find true love in the process?