Circe raised an eyebrow. "That is an unusual request. Most guests want to be lions, or stallions, or something else glamorous." Then she smiled. "Of course, you might also be thinking of sexual size - a bull elephant is over three feet long, though there is no dangling scrotum. However, you may have trouble finding a suitable mate - although there are elephants on the island, the herd is not large and most females will only cooperate if they are in heat."
Flushing a little, Derrick shrugged. "Just for a day or two - um, sex isn't the, uh, main reason. They are so big and strong! The biggest land mammal, right? It would be awesome to feel that mass and power. But I want to be aware of the change, not think being an elephant is normal. All the instincts, so I act like the bull, but my memories."
"Acting the beast, and aware of who you are." Circe nodded. "I am sure you will enjoy the experience, even if it turns out to be somewhat different than you expect."
"Different? Hooooowaaaaghng!" The boy's question turned into a trumpeting bellow as his clothes vanished and he swelled out huge and heavy. The world seemed to shrink around Derrick as he changed, dwarfing the woman and everything around him. He stood still for a moment, confused and then awed, before sudden fear took over and he turned and ran for the woods. The herd! He should be with the herd! Even though he shouldn't have known where to go, Derrick made a beeline through the forest, battering some trees in his haste. The thick, hard hide covering his body barely registered impacts even when he knocked down a couple of large evergreens. When he broke out into a large grassy plain, he saw a group of about a dozen elephants on the far side.
The sight calmed him and he ambled over to the herd, where he was welcomed with pats and twisting of trunks, as well as rubbing against each other. They accepted him without question, and he knew this was his family, his herd. It was a very strange feeling - all of this was new to him, yet he felt completely at ease. Well, not at ease - there was also an inner drive, a compulsion that made him seek out the females. He also became aware of an odor, his odor, and a stirring in his hindparts. It seemed he was a male in need of a female.
Circe could have been cruel and let that growing need be unanswered, but though he was rejected by the first three females, the fourth raised her trunk and moved away from the herd, her scent alluring. Derrick wanted to slow down, to learn about his new body and really savor the experiences, but the bull elephant mind instincts were in control, and he felt himself come erect. Massive member swinging underneath, he and the female bumped and flapped ears and twisted trunks in a kind of ritual that he performed without knowing why. Afterwards, he shifted behind her and pushed up awkwardly, rough, hard skin resisting and his own mass difficult to overcome.
It took several tries to penetrate, and Derrick was overwhelmed with need, with compulsion. Even as he thrust into the female, there was urgency more than pleasure, and more sense of purpose than desire. Even the mass of his enormous sexual equipment was simply sized to fit the female, so there was no real impression of being huge. Ejaculation was long and powerful, and when it was done, he slid off the female's back with a tremendous sense of accomplishment and satisfaction. They were both in prime mating states, and he knew that the female would bear his offspring. The thought of being a father startled Derrick - he had not really considered the implications of mating. The elephant felt no paternal emotion or even a sense of responsibility - it had done what it was supposed to do. If another female was in season, he would mount her as well, and possibly mount this one again. His duty was to provide seed and protect the herd. This simple mindset was in control, and Derrick found it easy to accept. Being an elephant was natural, normal even. He passed the rest of the day calmly grazing with his herd, not really thinking of anything at all, the boy almost totally assimilated into the animal.