Returning to Beacon Hills is a big step for Derek. He's starting his own business, rebuilding his old family home, and enjoying the feeling of being home. When he runs into the Sheriff and finds himself invited to a Stilinski family dinner, it's not nearly as strange as he would have expected, and when Stiles starts becoming a regular part of his new life, it only feels natural.
The first thing Derek notices is that Stiles is taller. The second is that he’s more filled out. This shouldn’t be a surprise. Not living in Beacon Hills doesn’t stop the machine of social media, and it’s not like he hasn’t seen pictures, but it’s different in person. Stiles, now Derek’s height, maybe an inch taller, still has the same wide smile and loose-limbness about him that he did when he was in high school. Between the height and the muscles though, this Stiles wouldn’t make anyone second guess that he played lacrosse. The only thing people would second guess about this Stiles is the fact that he was always on the bench.