Someone please save Derek though his former self sure was a bratty teenager himself, thanks Draco. That's totally plausible! Hiro likes to explore and he would be curious about new establishments/places he hasn't been to so TTB would be one of the places he'd pop into to see. Depending on how Derek treated him on first meeting I could see him coming back to see if Derek comes back and being amicable and at least pretending to listen to him (while actually absorbing what Derek says anyway.)