Lord Sr Krishna is the reservoir of all pleasure, and Srimati Radharani is the personification of ecstatic love of Godhead. These two forms had combined as one in Sri Caitanya Mahaprabhu. This being the case, Lord Sri Caitanya Mahaprabhu revealed His real form to Ramananda Raya. 

Upon seeing this form, Ramananda Raya lost consciousness in transcendental bliss. Unable to remain standing, he fell to the ground. When Ramananda Raya fell to the ground unconscious, Caitanya Mahaprabhu touched his hand, and he immediately regained consciousness. But when he saw Lord Caitanya in the dress of a sannyasi., he was struck with wonder. After embracing Ramananda Raya, the Lord pacified him, informing him, "But for you, no one has ever seen this form."