When do Chad and Sonny kiss?

'Sonny with a Kiss'
They kiss in season 2. In one of the last episodes!! They kiss on the cheek many times but in "Sonny with a Grant" (MAYBE I DON'T HAVE TO MUCH INFO) or in "Sonny with a Kiss". In "Sonny with a kiss", Sonny has the idea of kissing Chad but I don't think she does.