Futanari Gyaru Suzu-Chan no (Chi) Nichijou

From Beruru-sensei comes a sexy slice-of-life manga about an ordinary, big-dick futanari gal who could be found anywhere!
The way she, aroused by the newly opened pussy, gives in to the sexual desire of the powerfully erect cock and engages in slutty sex is just too erotic♪
Despite being ordered to perform sexual services as a penalty, the girls, instead of getting into the spirit, are surrounded by men and begin performing lewd acts of service—a situation that is incredibly exciting!

Source: Melonbooks, translated