Thank you very much for your lovely comment! That's the kind of comment this author lives for. :)
Some of my favourite moments were the ones where Harry’s caring revealed the neglect teenaged Severus was obviously used to. - I'm so glad you noticed and enjoyed those moments. I wanted Severus to be stunned at Harry's kindness - so that he realises, once he re-ages, that the Potter boy is very different from Severus's idea of him.
Ah, that morning after! A classic case of misunderstanding. How I enjoy torturing my poor boys. :D
No, Harry isn't bothered about Severus's age - inside the adult there's still the teenager he has come to love (and no one can deny that adult!Snape very often resembles a teenager!). But he was afraid that adult Snape isn't like teenage Severus - and he has reason to be afraid, after all he's made a lot of bad experience with Snape. Severus, on the other hand, was still reeling with being re-aged and the memories of the past four weeks. He's trying to reconcile the Potter he knew with Harry. And when Harry didn't say anything or look at him, well. He is a paranoid bastard and jumped to conclusions.