Overflow

"Brother, are we really taking a bath together?"</i> And so, a forbidden bathing experience began. Me, my sister, and childhood friend—one man and two women—are sharing one bath. After involuntarily "overflowing," the sister's secret love come out?! This is a young romantic comedy that won't let you say, "it's over!" (Source: Official Site, translated)

Idol Kouhosei

It's a new century and men have lost their sexual desires thus decreasing the number of marriages and births. In order to repopulate the world, the government decided to start a program to improve men's sex lives. Sex idols, girls who can sing, dance, and have sex with innumerable men, are now in need to help improve the stagnant society.

Idol Kyousei Sousa

Hibino Yua is an idol who does singing jobs and models sexy photos. She pretends to play the role of a pervert, causing many of her fans to send gifts like vibrators and other sex toys. However, that pretense leads her to become entangled with a pervert who possesses a magical device: his smartphone, which has magical powers that allow him to perform movements or touch things without touching them directly. (Source: Nekopoi, translated, edited)

Seiso de Majime na Kanojo ga, Saikyou Yaricir ni Kanyuu Saretara...? THE ANIMATION

Based on the erotic game by Frill. This girl enrolls in a tennis club in school. To celebrate, they all go drinking. However, she gets drugged, fucked, filmed and bukkaked on. Multiple times. Oh and her boyfriend is made to watch.