He’s not too shocked at the reaction. After all he could barely take his length so being forced down AND swallowing a load must have been hard. Luckily his hips have paused and letting the calico swallow.

Those purrs caused all sorts of nice vibrations around that panther dick lodged so deep in the calico's throat… just milking every last drop out of his professor. Patiently waiting for that hand to come off of his head so he could pull back for air… continuing to swallow obediently until he could.