Himmel knelt on one knee and put an eternal love symbol ring on her finger. That was as straightforward and daring an approach as it gets. Freiren is just asexual, as she already explicitly mentioned most elves (as rare as they are) are. They are so bad at romance and sex that they are going extinct for it. Himmel had no chance, and he knew it, so no matter how hard he pushed, it was going nowhere.