I don't know what comic you're reading, but his conversations with Kory seen here aren't even flirtatious, and certainly not "hitting on". He kisses her hand in a courtly goodnight (Whilst standing next to Donna), and Kory reacts to an Earth custom she's not familiar with.
Where I live, if you kiss someone on the hand, you're flirting with them. It may be different in other parts of the world, but, judging him through my perspective, his actions are entirely lecherous. To be fair, however, that's about the only time he comes off as creepy in these scans. (Other than when he says Donna reminds him of her mother.)