(I have this headcanon where Steve’s son his born with his original health maladies and wants to grow up to be just like his dad - and Steve is confronted with all these feelings of inadequacy as a father because he realizes his son can’t grow up to be like him. But no kid will probably ever be better protected from bullies, considering who all his uncles are. It’s probably just a matter of time before Uncle Tony builds him some really sweet replacement braces (“Should they have spinning rims? I feel like they should have spinning rims.”) - Siffy
The guilt and the feeling of selfishness are near overwhelming. All Steve had wanted was a semblance of normalcy, a partnership, a ‘family’. But his greatest fear became a reality when the weakness that haunted his dreams passed on to his skin and blood. It had always been a possibility, perhaps it was buried too deep in the recess of his mind where he pushed his insecurities when he had to be in control and command. But hiding behind the smile he always gives his handsome little boy are little pieces of him breaking.
Could things have been different? Was his illness and physical maladies going to affect any and all of his offspring? Should he have given up the foolish idea of having biological children? Just because the serum changed his hormones, changed his strengths did not mean immediately the transformation was genetic, he should have realized this! But agonizing would do nothing and he would always smile, because although the memories were brief of his own parents, he could remember them smiling. Giving him the only support they could when he accomplished the most trivial of things that to Steve Rogers had been an arduous mountain to climb.
Clutching to his chest a frail frame that shook with laughter Steve kissed the brow of his son and swung him up to play.
Nothing would stand in the child’s way even with the road blocks his body would surely make for him and Steve would help him strive and be there when the boy fervently declares his frustrations at his own limitations. At least this ill boy would have more than just a lifetime friend and a lone stranger believe in him and make him understand that strength wasn’t always the outside. More often than not, it was what was on the inside.