art by doppel, 2boys, anus, ass, bad id, bad pixiv id, blush, cuffs, docu \(doppel\), erection, fingernails, heart, horns, kiss, male focus, monster boy, multiple boys, nude, original, penis, perineum, pinned, ponytail, shackles, sharp fingernails, simple background, spoken heart, sweatdrop, testicles, uncensored, yaoi