1840x1035px GIF: https://i.imgur.com/zgSs6Tt.gif 

1840x1035px PSD: ButtSpread.psd (Attachment Below)

Based on one of the girls in this doodle: https://twitter.com/ManyakisArt/status/1286004377812008960 

Alternate Color

1840x1035px GIF: https://i.imgur.com/Eldb06U.gif