Seishirou Amaya liked Azusa Shirayuki. She asked him, "Will you let me lick your penis?" She brings him to an unofficial club that once existed, the Fellatio Research Club, where Seishirou's big dick is sucked to practice fellatio......!!

(Source: Mujin Comics, translated)

| Namespace | Tags |
| :- | :- |
| male | big penis, big dick, cumshot, internal cumshot, condom, filming, sole male, teacher, virgin, virginity, virginity loss, sweating |
| female | 69, ahegao, ball sucking, beauty mark, big ass, big breasts, bikini, bisexual, blowjob, blowjob face, breast feeding, bukkake, catgirl, cheating, cum swap, cunnilingus, deepthroat, defloration, exposed clothing, eye-covering bang, facesitting, femdom, fingering, focus blowjob, glasses, gokkun, gyaru, hairy, harem, high heels, incest, kemonomimi, kissing, leg lock, lingerie, long tongue, maid, masturbation, milf, mother, multimouth blowjob, multiple paizuri, nakadashi, paizuri, pantyhose, ponytail, rimjob, schoolgirl uniform, shimaidon, squirting, stockings, swimsuit, tail, teacher, unusual pupils, widow, x-ray, yuri |
| mixed | Bedroom, Co-habitation, exhibitionism, ffm threesome, group, harem, hidden sex, Indoor sex, outdoors sex, Voyeurism |
| other | Official Translation, story arc, Uncensored, multi-panel sequence, multi-work series, tankoubon, vanilla |

*Note: Published in Comic Mugen Tensei 2020-12, 2021-07, 2022-02, 06, 2023-01*