swapped breeding sandwich

A breeding sandwich with two couples where they agree to swap partners for the purpose of knocking each other up. This should only be left to couples that have a really strong bond with each other. It is better if both couples have engaged in and already had a set of children with their main partners in a normal breeding sandwich first.

Chloe: You know I thought conceiving my first child with James in a breeding sandwich with you was the most intimate thing I could do with a bestie, but the fact that you let me use Thomas's reprogrammer in a swapped breeding sandwich is truly next level.

Samantha: Yeah and to think that James knocked me up not only with your permission but with your blessing and participation really brings our friendship to a whole new level.