Nastu is at Lucy's house again, he snuck in while she was in the shower. Then someone knocks on the door, Lucy starts to turn the shower off and then Natsu yells "I'll get it, Luce". Lucy already knew he was there, so she turned the shower back on. Natsu opens the door to see no one. "Kids and their bad jokes..." Then as he was about to close the door, Natsu heard a short little cry as Natsu looked down his eyes widened he saw a baby...

It's about 7 years past the Grand magic games and they're all now technically adults. Everyone on team Natsu is now an S Class wizard and pesky mating season is starting but has a plot twist especially for Natsu that's going to change everything. (Lemons in later chapters of your not a fan I'll let you know ahead of time)

Lucy got drunk and made a little confession to Natsu, but in the next morning she pretended that she was too drunk to remember, leaving a confused Natsu. So they just pretend that it never happened and went into a mission that can change their single lives.