Darren has a fiance. James has a financially supportive girlfriend. But they're both willing (seemingly) to give all that up for just one night with each other. They may have come together for sex, but they discover honesty, anxiety, and fetishism in each other, threatening to turn this once off hook-up into something dangerously intimate.
It's a "will-they-won't-they" for male sexuality of the 21st century.