The Sebastian Guarantee by Krista Sandor

Phoebe Gale is a genius behind the keyboard, but her love life is a catastrophe. She’s sick of guys trampling on her heart.
Spoiler Alert: that’s about to end.
She’s been invited to a conference where she’ll get the chance to flaunt her tech talents and show these creeps exactly what they’re missing.
Hell hath no fury like a computer nerd scorned. It’s time to flip the script and transform into a man-eater.
Her success depends on her best friend, Sebastian Cress. Dubbed the hottest man on the internet, he’s given her his guarantee he can coach her to become a tech sensation and an irresistible heartbreaker. His assistance comes with a single rule. She must follow his every instruction–even in the bedroom.
What’s a little seduction training between friends?
Answer: It could cost them everything. A life-long friendship is at stake—but so is the chance to fall in love with their perfect match. The only thing that’s guaranteed is the hotter it gets between the sheets, the harder it is to keep the lines between friendship and love from blurring.