My wife keeps asking for double vaginal. It’s not easy finding another person. She has a guy she met that she fucked occasionally but she never asked him for 3sum.

Your solution seems to be right there. Have her bring him back, and both of you take her at the same time for the DP, double vaginal, split roast, ...

Double Vaginal
 

Only tried it once. My girlfriend(now my wife) and another couple. Ann and Tony are on the left and we are on the right. They we They came over with a swap in mind..we had not clue. We got really drunk on cheap bourbon and then started playing strip poker. We then swapped and eventually Ann Passed out. Marianne and I went back to our bed and shortly after Tony climbed in. He loaded up with the lube on the nightstand. Eventually Marianne got on top of me and we started to fuck. Tony came in from behind and Marianne helped him slide his cock into her pussy. I was a little surprised lol. We are both str8 but were really drunk so we didn't mind. I think it became more of a alpha male competition. Who could penetrate deeper and harder and make some good cock moves and last the longest. It was really hot having her pussy feel so tight. Marianne told us to cum at the same time, so we had to coordinate. lol. We actually did! He did leave a load on my balls as he was pulling out.

Sadly our one and only experience.

My wife
 

My wife said it was the most amazing sex that she ever had. She loved it. She would always encourage the black guys to make her airtight.