LF doujin succubu's idiot face

Its was a really short one with 5 pages more or less, its was a succubus girl in a mission with a guy and his twin brother that both were assigned a succubus, this one couldnt cum but his brother could, and the thing that really make me like this doujin was how cute and dumb the face the succubus make i think it was part of the title, sole male sole female, and his twin brother appears for one panel with other sucubus being jerk with her wings