My favorite scene would have to be the Ainz/Momon vs. Clementine fight. Defeating one of the most powerful humans (so far at least) using no weapons, no magic, just a hug. What makes the whole scene sweeter is the small hint of Ainz's humanity shining through his actions when he reveals his "hypocrisy" at the end.

[youtube]https://www.youtube.com/watch?v=lo8XNHVlCsw[/youtube]