It is

“Well thank you, son.” Your mum remarked. “And It looks like it is still attracting you.” She commented seeing your erect cock drifting in the warm water. “You know…” She said placing her hands on your shoulders and using them to pull herself closer, though the water. “Living in small communities with miles of open ocean between groups, not to mention, nowadays, dangerous shipping lanes between them. Those who get caught often find themselves on a plate so…” You felt her scales come in contact with your cock as she pulled you into a hug. “we mer sometimes find a need…” She pulled you down under the water and into a kiss. Your heads surfaced and you felt her tail wriggle between your legs, tickling your balls. Your cock pressing against her. “Inbred.” She concluded in a seductive tone. You almost felt like her words were penetrating your mind. Must be that ¼ Siren side.

You did not reply with words, you returned her kiss on the lips and began making out as you thrust forward. Your hard cock; that had been begging for action since you stepped into the room; sunk between her folds and into her vagina.

“Mmmm” Your mum moaned into your mouth as you penetrated her.

There was a gentle “Splish splish splish” as your ass was submerged and then broke the water with each thrust. This was replaced by “SPLASH, SPLOSH SPLASH” as your pace picked up and your thrust hard into your mermaid mother, water escaping the bath and soaking your clothes on the floor.

“Oh, Yes, Peter!” your mum moaned. She grasps her arms around you. “Oh yes yes mmmm blub blub blub” She moaned as she pulled you under the water. Her tail **** around you and pushed you under, pushing your cock deeper inside her.

You continued to thrust, your whole body underwater. You thought you should need to come up for air soon but instead, you felt pain. The same pain you had felt when diving. Your pleasure helped to dull it and your mother continued to hold you under as you continued to make love to her.