[Request] Haunted tickles

One of the attractions of the school's halloween event is the Haunted House, where any who enters is immediately invited inside by the ghost of the succubi who once inhabited the place, never to be seen again. Marin and Mai are cosplaying as the two succubi while Ako was roped to act as a dancer girl who became their victim for the attraction, but after tying her up to the coffin and looking at her all exposed and vulnerable like that, with such a revealing outfit, the two exchange glances and grin. They start to tickle Ako, who protests "H-hey! Hold on, I didn't sign up for this!" as she giggles, but once Mai tickles her armpit her laugh grows louder, so Marin gags her with a tape in order to avoid attracting too much attention. "Looks like she's all ours now, sis." Mai says, Marin nods "Yes, no one is coming to save her, that's too bad...", Ako's upperbody becomes their plaything, her laugh completely muffled.