She swam out to the cove late in the day, concerned that he hadn't returned yet and that none of the resort staff or guests had seen him since that morning. The sun was low in the sky, but she knew she had a few hours before nightfall and was hoping she could find him before then. She suspected he had taken a nap as he was prone to doing that after a swim, and that he hadn't noticed how late it was getting. As she swam through the warm water in a tight-fitting one-piece swimsuit and breathed through the plastic straw of her snorkel she felt surprisingly relaxed despite her concern for him. She could see how easily he could have been distracted by the pleasant water and beautiful life of the ocean.
She found the cave tunnel just as he had, and just as he had she was a little concerned when she reached the bottom and did not see bright sunlight at the end. She wasn't as strong a swimmer as him, nor could she hold her breath as long, but she still felt she could make the distance easily and pushed through until her head burst from the water on the other end. She breathed in the cool air of the shaded cove as she pulled the snorkel from her head and blinked her eyes, trying to get her bearings before she swam toward the sand of the beach. That was when she saw it.
She had no idea what she was seeing at first, masses of writhing flesh and hair, breasts and tails and tentacles, and what looked like large sea creatures wrestling with women. Her body froze in fear, but the response felt muted, dull compared to danger or second-hand embarrassment she'd felt before. Her feet felt rooted, and her eyes latched to the unfolding scene. It took her a long moment to notice that the animalistic parts were attached to the women, that they were one and the same, something out of myth. She couldn't believe it, thought that she must be dreaming, that this was both impossible and insane even if it were. Then she noticed what they had cradled between them.
She didn't recognize him at first, his body distorted in ways she could not have anticipated, butu it was there: the very human body of her partner, engorged at the abdomen and swollen as if pregnant. Her first thought was that they must have hurt him, that these were cruel and vicious things trying to kill her love, but that thought dulled as quickly as it rose as her mind felt a sudden blow against her consciousness, her independent thought, as if it were driven away by exhaustion and weakness.
She gasped and saw her partner's head turn slightly toward her, his eyes closed and a completely relaxed expression on his face. He was alive underneath that mass of tentacles and tail, his mouth wrapped around the areola of the siren's swollen breast. She felt confused, horrified, but also betrayed. She felt the wellings of jealousy, of rage, but couldn't seem to pull her thoughts together well enough to do anything about it. She felt a warmth in her, even in the warm water she could feel it spreading, starting at her groin and pushing up her abdomen and into her chest, into her breasts and suddenly noticed that they felt tender and in need of release. She couldn't understand why she wanted to touch them, why she wanted them out of her swimsuit and in her partner's mouth right now, but her body would neither do that nor run away, instead she remained transfixed as she watched them.
The scylla's stomach, somewhat slack and pouched like a postpartum mother's, turned a darker blue as veins appeared to spider across it, pumping and pulsing as blood flowed to that area. She began to grow, her stomach filling again as her stock of eggs began to replenish. It swelled and tightened, but did not grow as large as a full term pregnancy, her eggs not able to repopulate that quickly. Still, this change seemed to please her and she placed her hands on her stomach lovingly, running them over the firm skin before she slowly backed off of the man. He moaned in disappointment under the siren's breast as his cock slid free of the scylla, the cool air almost hurting against the swollen, massive, and pulsing meat of his phallus. His partner looked on without a noise, barely noticing that it was significantly bigger than normal through the thick fog of her strange arousal and exhaustion.
The scylla seemed pleased with this change as well, and grinned wickedly before one of the smaller tentacles wrapped around it tightly and another arched above it, poised for something. The first tentacle began stroking the man's thick shaft, using the mucus from her body and the siren's pussy as lubrication as he moaned out in pleasure, barely able to keep drinking from the siren as the scylla began to use him again. Then the second tentacle opened at the end, the fleshy exterior acting like a foreskin as the head underneath pushed outward a little. She drove the tentacled against his cock and pushed the tips together, the flesh of it slowly overlapping the head of his cock and then holding it still. His body stiffened and his partner gasped again as she saw his cock almost inflate, growing larger at the tip beneath the sheath of the tentacle and moving slowly down the shaft. She realized that the siren was pushing her tentacle into the urethra of his cock, sounding him, pushing it deeper and expanding him.
