The telly's been off for an hour, and your partner has just fished something clear and dripping out of a jug of cold water beside the bed. It's the Satisfyer Sparkling Crystal, a solid glass dildo with a tapered tip and a broad, round base, and the first cold press of that tapered tip will pull a "fuck" out of you before it's even inside.
Smooth on one face, grooved on the other
Satisfyer has pressed a run of curved grooves into one side of the shaft and left the opposite side glassy smooth. Twist it in your hand and the whole feel changes: slick and even one way, a rippling drag over each groove the other. It doesn't vibrate, so every sensation comes down to the angle, the rhythm and how wicked the hand on the base is feeling.
Chill it, heat it, swap halfway
It's borosilicate glass, and Satisfyer made it for hot and cold play. Rest it in cool water for a sharp, gasping shiver, or warm water for a slow, melting heat. Press it against the inside of your forearm first, so you know the temperature feels right before it gets near anything sensitive. When the chill fades, drop it back in the jug and start again.
The tapered shape suits vaginal or anal play, and the broad base stops it slipping in too far while giving your fingers something to steer by. Water-based lube is a sound pick; being glass, it'll take an oil-based one too, just never alongside a condom. Clear, firm and grooved on one side, it turns a cold drink of water into foreplay.