I've been playing around trying to get a bit of cleavage. I haven't got a lot of fat to push about but i've got a fair bit of pectoral muscle that I can push up and together to make a nice effect

Problem is getting it to stay there! It keeps wanting to spring back to where it was. I've had some success with tape, but if I move in the wrong way then my pecs tense and 'poing' I'm back to square one.

Any advice?