Mohammad Aslam and Maqbool Ahmad admit killing their sister Elahisen and a neighbour, Ghulam Nabi Shah, when they found them together in Elahisen's room on the night of 27 January.
They smashed their skulls with a brick and then strangled them with a rope. Then they gave themselves up to the police saying they had redeemed their family honour.
The event has a familiar ring to it.
According to official figures, more than 2,700 women and about 1,300 men have been killed in honour-related offences in Pakistan since 2001.
Human rights organisations put the number much higher, saying that most honour crimes are never reported to the police.
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