If you attempt to put on muscle mass while eating a sensible diet, you just may end up losing some fat around your thighs. Focus on eating clean and working the upperbody fairly hard with maintenance leg work.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano