Slow Chemistry by Silvan Ash

What is the equation for instant attraction?
Charlie Rust is thirty-one and getting impatient. He’s got everything in his job as a chemical engineer figured out, down to the last unit process. His romantic life, on the other hand… is in desperate need of troubleshooting. Time to swallow his pride and phone a friend for help getting a date.
Luke Irons is tall, blond and posh – and that’s literally all that Charlie remembers about him from a decade ago. Surely that can’t bode well for them hitting it off.
And yet, despite an inauspicious beginning, it turns out to be the best first date Charlie’s had, ever.
After so many disappointments, can Charlie bring himself to trust that this time will be different? And will the end product of this chemical reaction be the true connection he’s been hoping for all along?