how to properly spank a little:
1. make her get dressed up, put on cute lingerie, etc.
2. ideally make sure there is a dildo or plug inside of her.
3. make sure her face is either stuffed into a pillow, or that she begs you, and thanks you for each one.
4. rub her clit through her panties in the beginning, the longer the spanking continues, begin to put your fingers inside of her, briefly, make her lick them off, and continue spanking.
5. about midway, (or at the beginning) restrain her hands behind her back.
6. pet her, or hold her tightly by her hair while spanking.
7. when you are convinced she is wet enough, fuck her, or make her play with your cock, and beg for it- depending on when you restrain her arms.
This is important- subs need to associate spankings with pleasure, they are often not punishments- just gentle re-enforcements of their place as submissive little sex toy for daddy.
(Source: porn4ladies)