A story about giving a girl a laxative and then restraining her and putting a lid on her butthole

A story about giving a girl a laxative and then restraining her and putting a lid on her butthole cover

[えちえち大福 (猫大福)] 女の子に下剤を飲ませた後拘束してお尻の穴におちんちんで蓋をするお話