Y/n Stark wanted only one thing - to spend her semester break with her girlfriend Grace on a sunny European beach. But when her father, Tony Stark, asks her to come to the Avengers Compound and help with a groundbreaking project, she can't say no. Between all the high-tech labs, Y/n meets someone she never expected: Natasha Romanoff. The Black Widow. A woman who appears unshakable on the outside, yet Y/n gets to see a side only a few ever know. What begins as a friendship slowly turns into a quiet, unspoken attraction. But both know they can't cross the line. Between duties, secrets and sleepless nights a flame burns that neither of them dares to name.