Spanking Lap-Sex
The girl would need to be pretty flexible, but this looks like it would be a lot of fun as both a sex position and as a spanking position. Any time she stops writhing and working herself against you, all you have to do is freshen up her welts with that nasty little whip, and she’ll be squirming again in a most charming and pleasant fashion:
I can’t be certain, but this looks to me like artwork by Stig.
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I wonder how he got her tied up like that. Do you think he had someone to help him there? Or did he first do the tying and then, when she’s already hanging there, somehow take his place behind her? :)