Not all Stepdad-Stepson relationships are tense one.
Two Fridays ago, my husband worked all day building a little bridge and clearing a trail. It was hot and muggy and he was tired. As he came down off the ridge, he tripped over a root or something and put a pretty good gash into his head. Blood everywhere. I don't do well with that, as my children can attest. I cried and wrung my hands. But pulled it together because I had to to get the bleeding stopped and some temporary bandaging in place.
But the next day, he was back out there, wound wrapped up, helping my son with framing. Last weekend, my son needed to run to pick up more supplies and he asked my husband to go with him. The store is about 45 minutes away, so they were gone for a while while I worked on other things up there. Later, my son told me he felt like the two of them were getting nice bonding time in. It absolutely warms my heart to see that happening.