[sfem]

The massage may be stimulating/exercising your muscles. Having done some bodybuilding in the dim past I can tell you it won't prevent you from developing breasts. As a matter of fact it can sometimes cause them. It does sound like you will have a longer road than some because it will take time to be rid of the chest musculature if that is one of your goals. Using SP or a similar thing to block T conversion means some of that testosterone you use for muscle building will instead go to breast production by conversion to estrogen. Or something less simple than how I described it, but net effect is you are in a good position to develop breasts. Massage may not be your best approach though, as your chest may see it as muscle-building exercise. Maybe that is dependent on how you do it. I don't know.