Author's Note: In the myth of Alpheus & Arethusa, Alpheus' love/lust is never realized. In this version I decided that it is, but in a way that it's very close to a non-consensual union. So just be forewarned... and Enjoy!
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Arethusa was an exceptionally beautiful nymph, lithe and sweet with a voice the birds envied. A follower of the Gods, Artemis was her favorite and she was seriously considering joining the virgin's vocation, the strong female band of followers that joined the Goddess on the Hunt. But Arethusa hesitated because she was not a strong nymph, and she did not particularly care for the hunt, but she deeply wanted to be part of Artemis' elite group.
The Goddess had noted her attention, but respected Arethusa's reservations, waiting for the nymph to come to her own decision. Artemis' band was not an easy group to be in, the nymphs were expected to hunt, to run with the fleetest stags, swim like fish, and to guard themselves from all male contact. Arethusa was swift enough on foot and in the water, and she had never felt the touch of a man nor wanted it, but she also could not quite reconcile to the killing of animals. She did not condemn the Huntress or any hunters... but she was not sure that she herself could do it.
And so, there came a day when she wanted a bathe, and she chose the stream belonging to the River-God Alpheus (although she knew it not), and she did not have the Goddess' protection.
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Alpheus felt his waters swirling around the most enchanting form his cool reach had ever touched, supple thighs and firm pert breasts, long trailing hair like vines in his waters. He groaned, letting his presence rush towards the beauty bathing herself in his swift waters, and he circled around her body.
Arethusa was completely unaware of the River-God's presence, as she ventured further to the middle of the stream the current strengthened, and so she did not immediately recognize his touch. Water rushed against her thighs, middle and breasts, firmly pressing and sweeping away any dirt or grass that dared touch her perfect form. In fact, Alpheus scoured the beauty completely, running his hands over her perfect form...
The water felt both warm and cool against her body, pleasurable in fact as it pressed between her legs. Arethusa sighed in pleasure, feeling almost hypnotized by the water. Pleasure grew in her breasts and between her legs, she almost hummed with contentment...
Then, suddenly, a form was pressing against her from behind, the water had hands and the hands were gripping her breasts firmly... something nudged between her thighs at her pussy. Arethusa's eyes flew open, and she opened her mouth to scream... Alpheus dragged the beautiful nymph underwater... his lips on hers gave her the ability to breath in his stream.
Seeing the form of a man in the water, although the form was MADE of water, Arethusa felt faint with fear. And at the same time, the water was still inciting feelings of lust and pleasure in her... when she tried to kick away from the persistent River God, he just laughed and pulled her closer to him, pressing his lips to hers again. Arethusa could not bite down on his tongue, because it was just water that spilled into her mouth and down her throat when she did so... filling her stomach with his essence as much as if she had taken his member in her mouth.