Your wife has simply decided it’s time to start cuckolding you — and it’s obvious she doesn’t feel badly about it at all. It’s what she feels she needs to do — for her — so she expects you to accept that from now on, she will have a social life, and sexual life, that does not include you.
When your best friend told you that he thought your wife was really sexy and that he would love to have some time together with her without you there you weren’t sure how to react, or even if he was joking or if he was serious. And you certainly didn’t think it was something that your wife would want – but now you know that he was serious, and that it IS something that your wife wants.
“Are you SURE that’s what you want me to do?” you ask her.
“Yes” she says. “I’m sure. I’d like you to pack a small bag so that you can stay away overnight – and maybe for a couple of nights – and so that when he sees you leaving with the bag he’ll know that he and I will have plenty of time to really get to know each other better.”
This won't be the first time your wife has used this technique to seduce a pool boy when the two of you are on vacation. So you know what is going to happen. She's first ask him to put some on her back, then she'll lie on her back and express some concern about her breasts getting burned through her thin bikini, so she'll take off her top and encourage him to cover that area with lotion. And then she'll turn over on her stomach so he can put lotion on her thighs, and while he's doing that, she'll spread her legs to encourage him to move his hands up to her private area. After - there can be no misunderstanding about her intentions, and her seduction method has never failed to work in the past.
And you laugh a bit at the way she described what's going to happen as "probably" she'll have sex with him. "Probably"? You both know it's almost an absolute certainty.
Very naughty, and nice.