Adult Corner no Mamono.: Osananajimi ga Saseko no Furi Shita node Hametemita

"I'm gonna come... while they watch!" A bratty high school girl is totally exposed to the boys' stares... and is on the verge of coming!?
(Source: Coolmic)
Note: Simultaneously released in long-strip and traditional formats, with 9 episodes and 3 chapters respectively.