CAUTION, explicit lyrics! Like many of the songs I am currently posting, the origins are unknown. I have been collecting them over many years so if anyone can assist in identifying them or knows more about their history, please either post a comment or contact me so I can update the posts.
I want you is clearly an improvised song (listen to the amateurish drumming) and Harry seems to make up the lyrics as he goes along. Based around the same chords as 'Let the good times roll'/'Walk right back/Cathy's clown' it well be that this song was recorded during the Schmilsson sessions.