In "The Time Paradox", the two kiss and seem to take pleasure in it, although Holly was suffering from somewhat disturbed hormones due to the time travel disrupting her body's chemistry. Also, in "The Atlantis Complex", Artemis's alter ego, Orion, confesses his love to Holly and tries to woo her, although she is unnerved by his advances. In the last book, Artemis and Holly are in a crisis and Artemis finally realizes his affection for Holly and kisses her on the forehead which seems to be solely for romantic reasons, however, it is later revealed that this was also for the practical reason of allowing Foaly to have access to Artemis' DNA sample to create a clone and revive him. By the time of "The Fowl Twins", Artemis has created an artificial intelligence named NANNI (Nano Artificial Neural Network Intelligence system) in Holly's image, who views the pair as her parents, while regularly communicating with Artemis while on his mission to Mars alongside Butler.