I'm really really really not into the big butt craze. I much prefer really tight, lean asses. Yoyo of the sadly now-closed KLMT always wore super-tight leggings over her rock-hard little ass. I tried so many times to talk her into letting me eat that tight little ass, omg, sadly, always a no-go, only allowed over-the-clothes fun.
Wendy of XP/TT has one of the tightest, most muscular little asses I've ever copped a feel of, omg. She spends time in the gym, and whatever she's doing, it makes her glutes like granite.