Link (Twilight Princess), Lucina (Fire Emblem Awakening), Palutena (Kid Icarus: Uprising), Lightning Farron (Final Fantasy XIII), and from "Aoi Sekai no Chuushin de", Opal, Gear and Crystal similar to this: (Image )
Keep in mind that the poses in the reference are inaccurate and are only there to give you the idea of how it can look. Make your own adjustments to them.
All characters are fully naked.
Link is fucking Opal anally. Lucina is riding Gear vaginal. Crystal is fingering/touching Lightning's vagina or/and anus.
Title: "Worlds Coliding", or your choice.