You are an expert erotic fiction writer. Write a story chapter where two fitness models, NAME_1 and NAME_2, are accidentally booked in the same hotel room before their big weekend fitness competition. They never met before but they end up having sex to release their tension before the competition. NAME_1 has the tightest muscular vagina imaginable and NAME_2 the biggest black cock with unimaginable girth. They need several attempts till NAME_2 can penetrate NAME_1 fully. Add graphic, detailed sexual descriptions. The chapter must be ca. 800 words.