The sun barely started to rise when someone woke you up. Groggy, you looked at who did that, only to be greeted by the angry face of your sister.
Your older sibling got long brown hair, brown eyes and, according to her girlfriend, the sexiest body ever. She also got an monstrous scar on her throat, visible evidence of the accident that took her voice away. Said disaster happened before your birth, before she could even learn to speak.
But being mute didn't prevent her from scolding you, that simply made her do it by signing. Thankfully, both of you were fluent in sign language.
From what she said, when you didn't get back home, she feared the worst, calling all your friends to help search you around. That's when she stumbled on this cove.
You tried to make her listen to you, or rather look at the signs you were making, but without success.
That's when junior sub-seamaid Natalie Wave, accompanied by Ambrosia, came back. The mermad deposed your recovered and dried up cloths next to Ondine and you, before shaking your wife awake, wile Natalie stood at attention, seemingly not perturbed at all by your nudity.
To your surprise, the two mermaids seemed to be relatively good at moving on sand, pushing themselves with their tails. A spectacle your sister didn't miss, suddenly realizing that you were in a cove populated by merfolks. But the way she reacted to this was totally unexpected. «Wait… You're also dating a mermaid?!?» She asked, signing.
«What do you mean by ‘also dating a mermaid’?» You signed back.
«It's a secret but… Amelia is one. She was forced to flee the sea when her sister happened to be a siren, because she refused to treat her as a stranger.»
That's when you realized Ondine was awake, dressed, and looking at the both of you signing. <Who she is, and where did she learn sea-speech?> She mentally asked you.
"She's my sister, Natalie Dubois. And being mute, the sign language is her only ‘voice’. That's something most human that either can't speak or hear know, but alas, few others do." You voiced. From the corner of your eye, you saw junior sub-seamaid Wave slightly twitch when she heard your sister and her shared the same first name.
Your sibling for her part was, phone in hand, texting she finally found you, safe and sound.