How can i tell him i wana do it in person??? anser plz plz plz plz plz plz....?

ok so me and this guy are.... casual. we are getting dirty on webcam. we both want to d it in person but we r 13 years old and our parents are always home checking on us. we cant anywere ese cuz his gf mite c us. plz plz how should i convinse him that in person would be better we both want it. i need to convinse him. plz help me