Big idiot [NaLu]

Lucy has this big crush on Natsu, her best friend. Lucy is a bookworm and likes it best if she's home alone. But one day Natsu force her to go with him to a party. There is people and it's hot. Unfortunately there is alcohol and before you know it Lucy has gotten drunk. Not the worst kind but Natsu has drunk way to many glasses. Before the night is over she has slept with him. She gets terrified and before he wakes up she is fake sleeping on the couch next room. The next day he tells her he doesn't remember anything so it's like it never happened right? But times fly by and when her period doesn't show up, is it really like nothing happened?