'I owe you guys a crazy video, and in this one, I'm going to try and kiss my sister,' the sell-described prankster tells the camera at the start of the five-minute clip, before explaining that he was planning to ask his sister to play 'a really quick game for a quick kiss'.
He then clarifies that the woman in question - Kaitlyn O'Connor - is in fact his half-sister, meaning they are not 'fully' related, however he confesses that he knows that doesn't stop the prank from being 'really weird'. The fact that Kaitlyn is his half-sister also means that they are still blood relatives, however they share only one parent instead of two.
Chris also praised his extremely close relationship with Kaitlyn on his Instagram account just two days before the video was posted, sharing a picture of the two of them while writing: 'You’re my half-sister but it honestly doesn’t feel like it — so thankful we’ve stayed so close all our lives.'
After introducing the video, Chris proceeds to 'stalk' his sister for an hour, filming her from a distance as she walks around their house, before confronting her in her bedroom.
'I'm so nervous, I don't know if I should ask her,' he tells the camera. 'I've tried like five times to ask her because she's my sister and I don't want her to think I'm crazy.
'I feel like such a creep, I've been stalking my sister upstairs for the past hour. I feel like a creep so I'm just going to go up there.'
'You guys think I'm the biggest prankster on YouTube? My sister should have her own channel. She's been pranking me since the beginning,' he tells his subscribers, while recalling a time when Kaitlyn smashed birthday cake in his face.
The video then cuts to the two of them sitting on Kaitlyn's bed, with Chris exclaiming: 'I finally got the courage to come up here and ask my sister if she wanted to play a quick game for a kiss.
'I'm literally sweating right now because I'm so nervous.'
After Kaitlyn says she's 'not really' keen to go ahead with the prank, she agrees, with her brother praising her for 'helping him out'.
How was that?' he asks, adding: 'I am literally sweating so badly. What was that like?'
His sister tells him: 'I never want to do that again,' as he falls back on the bed and says, 'What I do for YouTube...'
'Thank you so much to Kaitlyn for being in this video,' he says as he begins to wrap up the clip. 'Our relationship will never be the same again.'