Nami has come up with a plan that she thinks will make her wealthy beyond her wildest dreams. She believes that, with the help of Nico Robin and Sanji, she can create a balm that makes men's penises grow when it is applied! All she requires is one unique ingredient: Luffy's sperm. And lots of it! She is under the impression that it contains an element of his stretching power and may even provide the recipient of the lotion with more stamina. To this end, she has taken it upon herself to milk him several times a day. She knows that Luffy will probably balk at the idea at first; but she is confident that after she has pummeled him a few times, he'll become more amenable. She even has a special vessel for him to ejaculate in. She wouldn't want to inadvertently spill any of his precious seed. She fully intends to collect every single drop. If it means that he has to endure a little post-orgasm torment, it is a small price to pay for the amount of berries that she will accumulate by selling her concoction!