The mermaid's gift

[T_B]

I'm 18 years old and I'm on vacation with my mom and dad age 37 on a small island 

As I was walking on the beach I saw a woman trapped in some of my dads fishing nets after getting her out  I found out she is a mermaid she told me that I deserve a  reward for saving her she looks into my eyes and sees that I have feelings for someone but also sadness because I can't be with her she gets out of the water and her tail changed into legs

She told me that she was going to help me get the one I loved but first I needed to fuck her after we finished she scooped out of her pussy our combined cum and told me that any woman who drinks this would have uncontrollable lust for me for 24 hours and if I cum inside she would be mine completely but if I don't cum inside her she'd be back to normal after 24 hours she then jumped back into the water and swam away

An my way back to the house I was thinking of how to get my mom to drink this

The mermaid has C cup breasts 

The mom has D cup breasts and a shaved pussy