Sincerely hope not.
The MC is already a simpleton. Take away his good heart, being fit and well endowed, and he's got nothing much left.
Plus, Cole's micropenis is an easy way to shut the rude narcissistic bully down, and there are already scenarios where the MC makes Cole his bitch because of it.
If there's going to be any size theft, it would be funny to see the MC borrow an even bigger D from some other character to be almost comically large. Maybe they run into a species that is considerably larger than them, and he has to borrow a huge one just so it works when having sex with that new species.