is a prodigious author of kinky hentai Flash games. His long-running Porn Bastards series borrows pretty female characters from popular culture (everything from Disney to manga porn comics to beloved anime series to the Marvel cinematic universe) and subjects them to the rough attentions of unpleasant but very horny male antagonists who aren't much worried about truth or consent. Mattis's sex sims tend to feature bondage and BDSM elements, humiliation, a bit of conflict and struggle, and a whole lot of raunchy sex. Mattis also uses hentai tropes like x-ray and cutaway vision to show internal penetration and impregnation.