It's like you have a painfully full bladder when someone you love decides she wants to suck you dry. She plays around until you're stiff, then sucks like mad.
Yes?
You know she wants it - needs it to live! So you let down and piss in her mouth for all you’re worth. She gobbles it down until you’re drained. She looks into your eyes and you bond forever!
Yes yes?
Then she puts her head on your shoulder as you gently pat her. After barfing half of it down your back she falls asleep.