>>103800316 (OP)
Diamonds are one of the hardest natural material on earth, however in recent years we have been able to create carbon nano-tubes which are harder. What I propose is a sort of Carbon Nano condom. You slip it on and push inside the tight diamond labia. Once you are get through the initial resistance, the insides will be much softer, mere crystal strength. With the Nanotube condom keeping the labia from snapped shut and tearing off your dick, you can push back and forth in her. The Nano tub will have a a small receiver, which can connect to your phone. With a press of a button the tip will open so you can safely cum inside Biboo.