Is This Real? {Sans x Frisk} [COMPLETE]

Info

So, this is obviously a Sans x Frisk FanFic. If you don't like it, then simply don't read it.
In this story, Frisk is a girl.
Papyrus is the older brother, by 2 years.
At the beginning, Sans is 14 while Papyrus is 16. Frisk is 12.
Later, Frisk is 17 about to turn 18. Sans is 19 & Papyrus is 21.
Might get kinda graphic. Just a warning.
One last thing- should it have a lemon? Leave a comment. (For all you dirty little sinners)
Hope you enjoy! -Cloud