Millie, shocked and somewhat afraid and disgusted at Flip's apparent show of affection, shook her head and kicked away from Flip, her scales reflecting erratic patterns on the sides of the pool, yelling "Flip, NO!" - which came out as hushed garbles in the water.
Flip quickly noticed, and with a look of concern and surprise on his/her face, made a quick click and whistle as he/she let go of his/her penis and quickly swam over to Millie, and before she could turn away, grabbed her tightly by her leg's shoulders, looking intently and pleadingly at her.
Millie, considering the possibility that Flip might become enraged if she declined him (or her) again and potentially force himself/herself on her, was trying not to panic as she, looking away from Flip's face, purposefully did not struggle in her former dolphin friend's grasp, even as Flip gently pressed their bodies together, his/her huge black nipples rubbing and then comfortably squishing against Millie's three that were still concealed by her shirt, as Flip raised his/her huge, pink phallus out from under Millie's body before situating it, squished, between them.
The cock reached all the way up Flip's body to just at the base of Millie's neck.
The two floated in the uncomfortable but deafening silence of the water, Millie still looking away as her four gill-slits undulated in a rushed manner, as she felt Flip's penis throb with need, wobbling slightly with every pulse. It was leaking a constant string-like stream of pre-ejaculate that snaked in the water like smoke from a candle.
Flip whistled again after a while, gently pushing his penis up slightly to tap Millie on her lips.
Millie, still looking away, and trying to calm her raging erections down - her members on her leg stumps had engorged to 2 foot-long, 3-inch wide, snake-like monsters, their balls and masts throbbing in near-tandem with Flip's member, again, shouted "NO!", and began to struggle, kicking with her legs and arm fruitlessly under Flip's iron grip before she began to kick Flip's sides and punch Flip and his/her lower dolphin torso's stomach with her arm's two fists, thrashing around.
Flip, confused and frightened, eased his momentarily tightening grip and let go of Millie.
She took this chance immediately - kicking and thrusting with all of her might to get out of the dolphin pool, aiming for the "ramp" to enter it.
She tried to dodge again, turning quickly out of the way as a long whistle sounded, but her shirt slowed her down for just seconds too long.
Flip grabbed Millie by her left leg, and then her waist, essentially tackling her in a deafening sea of bubbles, and agitated clicks and whistles, "clawing" up her body as she fought, shrieking, to get free, tearing Millie's shirt fully down the middle as she unsuccessfully fought to get free of his/her grasp.
No amount of kicks or punches could stop Flip from eventually getting the upper hand and fully, tightly pressing his/her body to Millie's and . . .
Giving her a hug - the penis pushed down to the side, bouncing, now semi-erect, off to Millie's right.
And a long kiss on the forehead, as many trainers had given to Flip, but none as long as Millie's.