I'm not a fan of futa. There's only one comic that has futa in it that I'm ok with, and that's only because they do it differently than most animes, at least in regards to character reaction:
http://g.e-hentai.org/g/383637/05da028730/
Otherwise, I'm just not much of a futa fan. It can be done alright and I don't mind it, but I'm not a big fan of straight out sex in BE's anyway. Well, I guess lesbian sex, I don't mind, lol. But for the most part merging of fetishes can be good. There are several other series that merge them either with one girl, or multiple girls with different ones.