Yes, it was in fact, quite torturous, but mostly for his partner who was the volunteer as not the guinea pig. It honestly wasn't that bad for Aziraphale who just dug right in and ate as fast as possible to make sure that it was safe.

That was totally why.

The two of them get led into a chamber for bathing, and Aziraphale waits for the staff to leave before he starts to disrobe in the antechamber, behind a dressing screen.