Wife teases me

My wife likes to get me hard then she will put one leg on the bed and bend over, she knows my short dick cant reach and giggles and says go ahead. All I can do is touch her pussy with the head I tried her ass and all I can get is half my head into that so all I can do is hump air intel I cum on the side of her leg and she just laughs, and she will ask how was it.