What Echo lacked Narcissus wasn't exactly a winning teacher. He abused her kindness every time he asked to see her. He was willing to see how far he could take her, power play her for his own self-esteem. He didn't care about how scared she may have been.
His kiss was soft and gentle, but her own was as timid as the rest of her. He peter her mouth open with his tongue. Gentle at first, just a soft lick against her lips, guiding her along.