Jealousy
Hi. I can't find this fic anywhere so I hope you guys can help me. I remember that John doesn't love Mary anymore, so he is very suspicious of her. He can't figure his feeling for Sherlock so he thinks that Mary is cheating on him with Sherlock (which doesn't happen, Sherlock loves John) and he confronts him (I think at this point Sherlock tells John about his feelings). I remember it having a happy ending.