Futa on male porn by Chinbotsu and Mare Ten. Not all the pictures by Mare are futanari or futa on male but they’re good.

Chinbotsu has some great comics here.
Comic by Mare Ten: [Futa on Male] Hornie Capture Comic by Mare

These ones are futa on trap/sissy pictures where the guys are crossdressing. Many of them look like women but the sources said they’re guys. Futa on male tag.

Futanari on male hentai porn.