Oh, I can explain this one if you still don't know, I came across these songs recently (which is an interesting story itself)





It's from the Vocaloid song "The Madness of Duke Venomania" (or Miss for the versions that use a female Vocaloid character and voicebank, maybe Dutchess Venomena in this case....) which is about a person who gains the ability to make any girl they want fall in love with them, including the childhood friend that rejected them when they were younger, and is eventually killed by a boy who came looking for one of the girls Venomania abducted which causes the spell on all of the abducted girls to break and they all leave. At the end Venomania sees his childhood friend turn back for a moment before leaving and he wishes she had stayed long enough for him to tell her he loved her.





Despite all this the female version of the video actually does sort of fit Pinkie due to the extra bits which include Dutchess Venomania's true feelings being the first person to be imprisoned (by the alter ego that's dominant for most of the song) and a part at the beginning and end showing that the video is actually a dream the character singing it had due to the song playing while she was asleep and the character cast as her childhood friend is one of her friends who went to sit next to her and notices her crying in her sleep (and who she then hugs after waking up), and the character used for this version actually does have a similar haircut to Pinkamena....And at least you weren't asked to draw her dressed up as Conchita (another character from this series of videos)