DxD: Dominant Training (Patreon)

Hoping to have a better title for this by release.

Issei is caught cheating on his Dragon Emperor training when Rias and Akeno suspect him of doing more than just that with the trainers they hired. As it turned out, the pair were sexing him up, as Issei's cock has gornw gigantic thanks to the dragon genetics splicing with his dick. Now, the king and queen of the peerage want in on the fun as well.