While you kiss Mina, you get a sudden mental picture of what's currently taking place inside you. You see his sperm, freshly formed and desperate to fulfil their biological purpose, eagerly swim inside your body's depths, surging through passages which were only minutes ago carved out. You accommodate them instinctually, hormones and scents guiding them upwards to their desired place to settle.
You see your ovaries, tucked up in your crotch having previously hung outside it as your testicles, quake as they evacuate a large, round cell. This is your egg, the cell filled with instructions to form offspring when triggered by a sperm fertilizes it.
Your heart races as you see Mina's sperm start to surround it, each and every one to touch it wearing away at the outside and aching to get inside. You can tell it's inevitable one of them will do so, and it will form your and his baby.
At last, one does, and the egg moves downwards to settle into your womb, dividing into multiple cells and implanting into you. You've gotten impregnated by Mina, you realize.
You stare at him, open-mouthed both out of shock and because you're gasping for air, as you come back down to Earth.