So many options...you can't decide!

You can't decide what you want. You just go ahead and pick multiple penises. You specify that they all should be long since you don't know if they are all going to be attatched to her crotch at once or if she is going to switch them out somehow like a strapon. When asked for a length, you just put in three feet. Then you proceed to fill out as many variations as you can think of:

normal thickness

double normal thickness

thickness of her forearm

thickness of her thigh

then you copy and paste and add to the end of each:

with a really fat mushroom head four times the normal size

then you paste the first four again and add to the end of each:

with it being narrow at the end and getting to full thickness near the base of her shaft

then at the end you add:

and she should be able to shoot cum from them all at once.