Mary's eyes had closed as she basked in her bliss, only opening when she heard a commotion nearby. Hitmoi was splashing around, floating on her back as her tail writhed and she moaned loudly. The sound of her passionate cries were like music to Mary's ears, returning the heat of arousal to her chest as she watched the other mermaid tug and pull at her bare nipples.
The buzzing pleasure that her moans brought to Mary's audiotory senses were quickly joined by a borderline hynoptic aroma. It made her nostils flare, desperate to take in every possible whiff. So sweet, mouth-wateringly so... it was coming from the other mermaid. Any thought of how strange it might be, how she'd never once felt such things come over her in regards to a woman, completely vacated her mind, as she was drawn over to the moaning Japanese girl.
Without thinking, she guided the other mermaid against the cave wall, pinning her against a smooth rock. Hitomi's hands didn't leave her breasts as her soft eyes met Mary's, their gazes exchanging more than words ever could. So much want, so much desperation for relief - it made Mary gasp quietly before she dove her head down, heading straight for one of those perky nipples with an eager tongue.
With great gusto her lips assaulted the girl's soft flesh, teasing around her areola before she clamped down on the nip, sucking like she'd never sucked before. It was to her shock that she felt something squeeze into her mouth, a liquid, something so sweet, sweeter than the sweetest honey she'd ever tasted. It was... milk, not unlike her own wonderful milk... yet with its own spice, a flare that set it apart from what her heaving rack could produce.
Confusion reigned for a fraction of a second, as her mind raced to process this development. Hitomi had said she wasn't lactating... but that was before she'd drank Mary's milk. If her body could be magical, then maybe what it produced was too - maybe her milk, ingested by another mermaid, caused that woman to develop her own precious white nectar. It seemed like a reasonable theory, at least.
But she hardly had the mental capacity to devote to analyzing the situation in-depth. Mary was far too lost in suckling at the large teat of the japanese girl to think about anything else. Her tongue danced hungrily across Hitomi's breast as she sucked down every last drop, hands moving to assist the girl in bringing the other breast to her own mouth. They both moaned in pleasure, the dolphin-mermaid increasingly thrashing in ecstacy beneath Mary's pin.
When she finally could take no more and experienced her first milky release, she finally shook free, her heavy shuddering tossing Mary away by several feet. She rushed back in to kiss the girl as she screamed, their arms and tails wrapping up as tongues lapped up the taste of each other's mouths. She soon felt a second climax of her own, but refused to take her lips from Hitomi's not until they were both out of breath and panting, holding each other and floating on the surface.
Hitomi was the first to speak. "I... have never experienced something so... wonderful..."
"Me neither..." A goofy grin was plastered onto Mary's face. "Guess uh... guess my milk's contagious. Sorry."
She shook her head, blue locks now showing streaks of white. "Oh no, there is no need to apologize. I... I love it." She swallowed audibly, reaching down to heft one of her now even-larger breasts; the motion caused Mary to realize that her own bust had grown in size. Huh. Was that a side effect of drinking another mermaid's milk? And if so... she wondered just how big they could get.