LOL. Poor Dean, Sam is never ever going to let this go. "Remember the time you attended an angel orgy..?" will be an effective way to shut Dean up for years.
Otoh, Sam could pout about how he missed out on the anthropology event of the decade...
Sam: It was the anthropological event of the decade, Dean. Cas: [head-tilt] If you wish to attend a lek, Sam, I'm sure Balthazar will invite you if you just make your interest known. Sam: ... really? Cas: Balthazar is always looking to impress women with his sexual prowess. Your participation would in his party would enhance his attractiveness considerable, as it would prove that even humans find him irresistable... Sam: ... I'm not sure how I feel about that.
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Otoh, Sam could pout about how he missed out on the anthropology event of the decade...
Sam: It was the anthropological event of the decade, Dean.
Cas: [head-tilt] If you wish to attend a lek, Sam, I'm sure Balthazar will invite you if you just make your interest known.
Sam: ... really?
Cas: Balthazar is always looking to impress women with his sexual prowess. Your participation would in his party would enhance his attractiveness considerable, as it would prove that even humans find him irresistable...
Sam: ... I'm not sure how I feel about that.