BoringGuy: You're probably right. I should just ask. She's actually already met my wife on several social occassions, and met her new boyfriend, too, so she knows the deal.
ManofDiscovery: Good stuff. I think maybe my lack of confidence in my dating skills is a big reason I've had fewer FWB's than my wife during our short, open-marriage.
I guess I'm having trouble discerning that fine line between wanting to seem eager yet not TOO eager.