VOSS-152 - The mother has to untie the key from her son's friend's erect penis to unlock his handcuffs.

It unfolds exactly as the title suggests. But the son has locked his friend's junk with a padlock... Since he can't move, it's all automated from fellatio to penetration and creampie. In the end, he's handcuffed but can still move. It's a house where men keep appearing with padlocks on their junk and handcuffs on their wrists. It's pure chaos.