Bobby nodded in approval. Emma slid off the couch to the floor, pulled Bobby's pants the rest of the way off, and spread his legs wide. She slowly moved her mouth to Bobby's slit and teased it with her tongue and got a moan. Teasing further she finally slid her tongue in, only to find something in the way. Something sliding out toward her. She opened her mouth and enveloped it then slid down to the head.
"Good news: you're not a mermaid."
Bobby only had a moment to sigh in relief before Emma was pleasuring him again. As she slowly worked him up, one hand slid under her bikini bottom to find her own slit. It was warm, wet, and felt reassuringly familiar. When she thought both of them were ready, she slid her mouth off Bobby and slowly stood up. Bobby's eyes had been closed enjoying being pleasured, but now he opened them again. Emma slowly untied her bikini top to give them both the first look at her transformed breasts. The gray skin seemed to remove all trace of her nipples and areolas, but otherwise her breasts were the same modest but pleasant size - and probably a little firmer. Dropping her top to the ground, Emma fondled herself and lost herself for a moment. Then her attention returned to Bobby, erect and waiting. Emma let her bikini bottom fall to the floor.
She mounted her waiting boyfriend, their lips meeting as the two part dolphin people rode the waves of pleasure.