手コキカラオケ 手マンカラオケ
An 18+ [[karaoke]] game show where contestants compete to win prizes by completing songs without any mistakes. The contestants are given [[handjob|handjobs]] by a particular AV celebrity with only a small curtain [[implied_handjob|hiding it from view]], and must endure them while singing.

Despite the "tekoki" in the tag name, the sex act involved doesn't strictly have to be a handjob; a common variation is "[i]teman[/i] karaoke", which involves [[fingering|vaginal fingering]].
tekoki karaoke