You both enjoy it equally.

You can see delight in Kako's eyes as she feels your balls press into hers. You feel the same way as her growing belly presses into your own. Your breasts seem to produce milk at the same rate Kako's testicles produce cum. Neither your tits nor Kako's nuts seem to shrink with the huge volume of liquid being expelled.

"That's right, Kako, these tits will never run out." You feel her middle to see how she is doing. She is feeling bigger than ever, but still not even filling out the sides of her shirt.