Everyone has secrets– and for Peter it's the five love letters hidden away in his room, all enveloped and addressed to the respective crushes he experienced throughout his life. He's always figured no harm's done, with his feelings written down and never to be seen by anyone else; at least, that's what he thought. Until all the letters are out, and Peter's sure that his entire life is coming to an end. Nothing good can come out of this, especially when one of his letter's recipients, the infamous Tony Stark, high-school heartbreaker and popular kid, proposes they start a fake relationship to make his ex-girlfriend jealous; in return, Peter wouldn't have to deal with telling the truth to the other four people who received his letters. It's a stupid plan that Peter's pretty sure won't end well– particularly because he's falling madly in love with his fake boyfriend.

(My friend had given me this prompt)

You could do this with different characters if you want just tell me.