[Corundum] That Time I Went to Karaoke With the Older Onee-san [ekiB]

A casual karaoke session with a voluptuous dark-skinned gyaru onee-san turns scandalous when she feels her young companion's hard-on pressing against her mid-duet, and she wastes no time teasing him about it. His twintailed little sister insists she's nothing like her honest big brother, but the older girl unbuttons her school shirt and coaxes both siblings toward a sweat-drenched ffm threesome of shared kisses, eager girl-on-top riding, and increasingly sloppy blowjobs. With the sister breathlessly asking for her turn and the onee-san purring over every strong suck, the private room heats up far past anything on the song list.