Of course it's possible. I'm on sust, deca, and anadrol right now. And am fairly lean, probably a four pack instead of six and a little loss of shoulder and upper chest striations, but that's about it. I consider that fairly lean. I'm about 10% BF always, and that's genetic, so that may be a factor. Also, my spouse is the diet and healthy eating queen, so that's well taken care of. But with favorable genetics and a good diet, yes, you can stay lean on test and deca, or any anabolic for that matter.