Firstly - GREAT Cock... you deffo don't need to be any bigger
But if you do here are some pointers. From your first picture which shows your body (which by the way I love
), it's clear that you have the average amount of body fat for a normal person. To lower the fat that is stored around your penis you'd need to lose some weight to lower your overall body fat. Unfortunately you can't target particular zones to lose fat, it's an overall thing. So may take a lot of weight loss to show visible results.
Looking at your pics I don't see much fat around that area anyway. It looks to be more tissue from the lower abdominals, but there will be a small layer of protection fat over that. So I don't really think there is much you can do in that situation, i've seen guys with a fair amount of fat in that area and you don't seem to have any
All I can say is that in my opinion you don't need to get any bigger, and that trying to reduce body fat to get a bigger dick probably won't give much of a result as you appear to be in good shape. Could you maybe put some more pics showing your abdomen and cock in it? Both front view and side view. That way we can get a better idea of the situation
Keep us posted on any changes or plans. And hope this helps in some way