Uchi Wa Futago De Teippai!

As the eldest son for the Kadokura family, Kouhei’s biggest worries are his younger twin brothers, Aoya and Shion. Despite always being foiled in love by his younger brothers, the virgin Kouhei has finally landed himself a matchmaking session. But, saying “our true desire is you, big brother,” the twins pounce and teach Kouhei how to feel good!
(Source: Eggy Scanlations)
Included one-shot: Kamakare