Yeah, Brint's Christmas scene is just fantastic! Truth be told, I love basically all of his scenes, excepting one or two. The no-lube anal one hits so many of the right buttons for me, and I just melt at the whole gentle Dom thing he's got going on. Even with the Sleepy Snake scene up in the Frostwood (which I tend to avoid, personally), the little dance between Brint and one's character makes me feel Illegal Emotions. Quintillus' anal scene is damn nice, and it's the one I usually go for unless I plan on having him knock up my character. It has me chomping at the bit for more scenes in which he's more dominant, even though I think the dominance games that make him lose his cool are absolutely delightful. (Both Brint and Quin's post-birth scenes are also way up there.)
The Drider Queen's egg sub scene is also great, and I especially love how she treats the character with surprising gentleness afterwards.
Non-sexually, chatting with Hretha's always nice, and there's something about those scenes that makes me feel as though my character's really connecting with her: I think it's the general tired gruffness and clear-headedness of her personality's contrasting with the sort of gentle care she has. I definitely see her as the exhausted, worried older sister that she is, which it doesn't feel as though she shows to many people, making the interactions we have with her seem particularly special.
Personally parleying with Hethia was not only a pleasant surprise, but also a really engaging, awesome scene, and I'm excited to see her again!
I'm not sure if these are my favorites or not, but the really limited scenes that hint at something bigger really captivate me. Speaking with Sigrune is really exciting, and the tense discussion one gets with Komari after beating the kitsune dungeon definitely ranks high. Pre-update Evergreen scenes were also particularly fascinating, and post-update, the new scenes added a lovely twist to the mystery that keep turning my perception of Evergreen's character on its head. Essentially, they feel like big, complicated puzzles that I'm itching to untangle and make a lasting impression on me.
Also, every scene with Kassyra.
(can you tell I have trouble choosing favorites)