It was a rather unorthodox request, and, I realise, something of an imposition on any professional's space. [He knows he'd hate being scrutinised while working, for one... not that he's overpaying out of sympathy.]
If you think it is too much, then please, name your price. [But you know. Sebastian's planning on imposing like this more times, quite possibly. He'd consider this paying in advance. Bribery for the future, if you will. That, and he has more money in Kiseki than he knows what to do with.]