On the 5th day of cumming...enjoy an Xmas Jam!
By jam, I mean tune! Put on some Xmas music (whatever you like) and do a sexy dance while pleasuring yourself! (If you're looking for something with a bit more of a beat, try searching YouTube for "Xmas Nightcore".) See if you can cum while dancing!
If not, after the first three songs, you may sit down and fap to the music. Find a rhythm or beat in the music (you may change songs if you can't find one) and stroke using that rhythm until you cum. Careful though! If you cum early, you have to finish (still stroking to the beat) that song!