Thief in the Night
Waking up your girlfriend by rubbing her private part. This increases your chances of her accepting as women are most horny when they first wake up.
When I got off work this morning I pulled a thief in the night on Tina. 100% success ratio. :)
Thief of the night
Someone who rapes people of the time of darkness.
The thief of the night was caught after being found out with multiple victims.