The position was more than convienent.
The first thrust very nearly drove Rachel into a sea of stars. The moment he drove in his dick into her from behind, her muffled scream echoed through. He fucked her for just over five seconds before the water works came. The sixth thrust brought in the first drops of pre-cum, the seventh brought the first direct shoot of sperm into her womb.
Alex dug his fingers into her waist, and began to ram her energetically. His balls clapped against her soft ass, as his penis slurped inside of her with each retreat and attack. He did not spare her. Repeatedly, he continued to inject her with his seed, fucking her enthusiastically, driving his dick forcefully in and out of her pussy, until he was sure he his nine inches was now hitting her womb.
Rachel's womb, already anticipating his semen, began to digest it immediately.