Aortic valve endocarditis can lead to secondary involvement of aorto mitral curtain and the adjacent anterior mitral leaflet (AML). The secondary damage to AML is often caused by the infected diastolic jet of aortic regurgitation hitting the ventricular surface of the anterior mitral leaflet, or by the pronounced bacterial vegetation that prolapses from the aortic valve into the left ventricular outflow tract. This is called "kissing lesion". We describe a case of infective endocarditis of aortic valve in a 13-year-old child causing secondary mitral valve involvement with AML perforation and aneurysm formation.