it was an act of devotion in the Gospels
not whatever the f*** you thought it was cause King David did it lmfao and it’s not included in the other books because John focuses on Jesus’ divinity and personal relationship with God which he wanted to detail while the other gospels focus more on a “community” aspect of Jesus
Those who are at the top levels, those who are in the know in the christian church they know the truth and those who draw and paint sacred images of the last supper they know the secret..
Here is a picture of Jesus with the disciple he loved the most

Notice the position of the scroll and notice the position of the disciple..
And here is another one lest somebody say that it was simply a mistake

Jesus is pushing down the head of the disciple. They say it’s blessing the head of the disciple but that’s clearly not what’s happening here is it @OS9
You need to be more worried about the founder of your own religion’s sexual proclivities boss