Delta Flame and Iron Heart are two twins who get along very well. But what will happen when Iron tries to take their sibling-hood to the next level, and how will her brother Delta react? For one possibility, choose "Irresistible". For another, choose "Undeniable". ((This story only has OCs, so if you don't like OC-focused work, please don't give a bad rating just for OC use or content. So yeah, OC warning, incest warning, blah blah blah.)) Cover image is by TheIronHeart at http://theironheart.deviantart.com