Princess Octavia and Loona are from YouTube's Helluva Boss and this screenshot's taken from Valve's Garry's Mod.

The autistic Via and her sister-figure and bodyguard, Loona, from their alternate universe, just had lots of fun dancing and such at some disco party and her highness went tired a lot more than she does and is resting on her shoulder to get some sleep while waiting for their bus from their universe's Hell to pick them up. At least they have each other to spend time with like sisters.