Put her in her place.

"Fuck me!"

You suppose you can oblige. Of course, it was her fault for failing to specify where you would fuck her. Song groaned in anticipation as your tentacles surged back up her legs, thicker and meatier, stretching out her stockings as you wiggled back up her skirt. You slide over her panties, adding to their dampness, and playfully squirm at the elastic edges. Song writhed under your teasing advances and continued to demand satisfaction, telling you to fuck her hard. She has no idea...

Painstakingly you slide the thin tips of your tentacles into the leg holes of her panties, slithering across her taint for long seconds while the stimulation drives her wild. For good measure you split hundreds of mini-tentacles off the main stalks, forming featherlike brushes that tickle across the sensitized skin. You teasingly whisper across her pussy lips, barely touching the skin but more than enough to get her dripping. This seems to be enough for Song, at least for the moment. She's settled into a high pitched squealing as she continues to thrash against you, instinctively pushing for penetration.

Her arms are wildly grasping for purchase on the leather seat and you reach out to subdue them. You slide around her wrists, your rubbery flesh giving only slightly to her struggles, and pull them up over her head: shoulder-length apart. At the same time you bring one of your upper tentacles to hang before her face, curling seductively before her moaning mouth. She takes the bait, leaning forward to envelope the slippery mass with her lovely lips. She sucks hard, drawing inch by inch into her mouth through suction alone. Her cheeks hollow out and she looks up at you through heavily lidded eyes, making delightful little sounds as she massages your length with her tongue. Before long you have to pull back before your tentacle slides down her throat, instead you spool your appendage around her flexing tongue.

Song is surprised by the maneuver, still not accustomed to alien physiology, but quickly settles down. Releasing her suction she gasps for air around your member, sloppily attempting to "french kiss" you after she catches her breath. You're having none of that. You hold her tongue immobile, continuing to push more of yourself into her mouth as you curl around the struggling muscle.

"Wa-a-ugh-ueigh?"

Confusion plays across her face as you remove her freedom of movement, tightening around her wrists, sliding more restraints around her elbows, and gently twining your tentacles into her hair to hold her steady. Time to remind her who was in charge. The feathery tentacles press just a bit harder on her sensitive mound, twisting delicately over her erect clitoris. You slide a thicker tentacle under the elastic band, brushing lightly across the cleft of her pussy lips, before slithering over her taint and up through her butt crack.

"WAOo-Oah!"

Song arches into your frontal stimulation and away from the slimy invader crossing her rosebud, eye's wide and surprised. You take a minute to hotdog her tight little ass cheeks, lewdly poking up out of the back of her panties with every peristaltic thrust. Then you focus on your main target: her tight little asshole.