Carissa?

After a couple minutes Gabriella actually starts to get into it, whether consciously or not it's hard to tell. She's using her tongue to wrestle with your tentacle, letting out moans and grunts as you send peristaltic thrusts through her body against the normal flow of things. Your slime is leaking out of her mouth, drooling across her still-bound chest. You adjust her slightly so it lands directly in her cleavage.

Meanwhile, you're still massaging Carissa's prostate and she's opened her eyes. They're heavily lidded with lust and they're also fixed on her mother, watching her curvy body writhe on your intruding member. You've undone the front of her blouse, pulled up her skirt, and are enjoying watching the beads of sweat roll across the tanned skin. Reaching around behind her you undo the snap of her bra and carefully tear it free without damaging or removing the rest of her outfit. As you expected she had no breasts to speak of, only tiny nipple nubs which are currently fully erect.

Your ministrations have caused the bulge in her underwear to blossom and the tip of a rather diminutive cock peaks out from behind her panties. You spread her legs out to have better access to her ass and slide a tentacle around her balls while you're at it. You thrust deeper but maintain a painfully slow pace that she quickly matches, you give her balls a gentle squeeze every time she lifts up. You retract your tentacle from her throat slightly to enjoy her moans, playing with her tongue instead. She gasps and groans throatily in time with your movements but never takes her eyes off her mother.