You said you'd go into bed soon
So I snuck off to your bedroom
And I thought I'd just wait there
Until I heard you come up the stairs

from T-Pain (Ft. Lily Allen & Wiz Khalifa) – 5 O'Clock Lyrics on Rap Genius

Meaning

Lily’s original intention for heading towards the room was to sit there and patiently wait for his arrival. Once he got there, she would please him sexually, however, she changes her mind and fakes her sleep once she senses him — maybe out of fear of confrontation.

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