There were days that the motivation for working out just to be healthy and feel good about myself was not enough.  Dragging my lazy ass off the couch and groaning the whole way into the gym I lay back on the bench and started my first set.  Then I saw her sit down, slick hard body doing shoulder lifts as her heavy breast slipped from her tight top.  Rep after rep she strained as more of her breasts were exposed.  My cock grew hard and I found myself unable to lift, just lay there and watch.  She had to know everyone in the place was watching her but she didn’t seem to care.  When she finished she stood up and walked past me.  Her eyes wandered over the thick bulge I carried in my shorts for her as she stopped leaned over and traced her fingers along.   “Meet me in the showers in 5 min.” she teased as she headed for the locker room.  “I think I just found my motivation for my most important muscle.”