Does anyone know the name of this manga?

i know its not a lot to go on but i remember a manga i read years ago, perverted type, its about a boy and a girl, only scene i remember is they are in a fighting robot facing off against a bad guy in a robot with a penis cannon, the robot fires a huge shot and an old lady says " quick after it fires a huge load it needs time to recharge" and someone else says "sadly thats true about most men"

another line isthat same scene the girl and boy are very cramped in the robot, the boy is rubbing up against the girls back, she asks what is that poking me? he says like its the growing tree of the puberty forest, i dont remember, it was years ago and it made me laugh ive been trying to find it anyone think of what it could be? i know its not much to go on but its all i remmber

please and thankyou