As someone who has paid for many threesomes in cash, I can say that however wild a time you have, afterwards you feel next to nothing. No real sense of achievement, just hopefully a calm satisfaction.
I've had more mediocre experiences than not. Either the girls weren't into each other, or one of them was a total b!tch, or they wouldn't allow the sort of depravity that civvies (girls you don't pay) would normally jump at the chance to (s)exercise, etc, etc.
In February though I paid two Russian identical twins for a couple hours of their time. Taller than me, very busty. An itch I've always felt compelled to scratch ever since I developed a twoitis for identical twins way back in 2008, and having crushed on other twins since.
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They were wild and eager to outdo each other. Vigorous three way rimming, mutual choking, biting & slapping, face fvcking, anal, everything except watersports which they didn't do. I shared the same condoms between them both. I brought a can of squirty whipped cream along but they wouldn't go for it; "vee aff to votch our veight".
I was absolutely knackered afterwards, and my wallet was lighter, but I won't deny I had a gratifying time. And yes, after those two hours were up I had a favourite. Slightly shorter, cuter face, softer ass, meatier labia, unshaved too. Not quite as busty as her twin though. I cvmmed on her face and watched her sister lick it up before they kissed. Then we all crammed ourselves into their shower together. I went for Naples' biggest pizza afterwards. 16 incher.
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TLDR: you can have a fun time if you pay but it'd be a lot more fun if you didn't pay.