A Certain Scientific Railgun - Kuroko Shirai (futa) is fucking Mikoto Misaka's pussy in the missionary position. Both of them are wearing the costumes seen in the 7th reference, with Mikoto also wearing a Santa hat while Kuroko has her hair let down. They are both holding each others' hands and are looking at one another with smiles on their faces, with Mikoto looking a bit flustered.