Vanilla, reading these is usually more for the warm fuzzies than the fapping truth be told and the more adorable the better. Always on the lookout for any new Homunculus releases as they have never let me down :)
Not sure if many others have mentioned it, but my favorite tag is kimono. You have the contrast between the classic beauty, and the spunky ones dressing up for a festival or hot springs trip. Really gets me going.