Twincest by J.X. Williams

'They Doubled Their Fun with 'Twincest''

'Marty should have known from childhood that she could never be the lifelong companion of her man-hating twin. And 'Twincest' was not the answer-- not until the incident involving Pete and the college president's flower bed....' (from the back cover). - See more at: http://www.appledorebookshop.com/pages/books/8525/j-x-williams/twincest#sthash.qvSaT2HQ.dpuf