In the English abstract to A. Schmitt, In Liwat Im Fiqh: Männlichen Homosexualität?, J. Arabic Islamic Studies, 2001-2 (URL; pdf), we have:
Although in the classical period some Hanafis believed [anal intercourse] to be allowed in paradise, later the Hanafiya narrowed the gap with the other madahib
This leads to the question:
Question: Which classical Hanafis believed anal intercourse is allowed in paradise?
The answer to this question is probably in the paper, but it's in German. Googling the title of this question doesn't help much.