My wife's BF moved in with us temporarily a week ago. His lease was ending and he's in the process of buying a condo and we invited him to live with temporarily. We started off as a hotwife couple but we're definitely embracing the poly lifestyle and have no regrets so far. For anyone curious, she's slept in our room four nights and his three nights. One of the days I walked in on them having fun in the family when I got home from work but I think that was planned as a tease.
I wasn't sure if I'll have any regrets or feelings of jealousy but I can honestly say that I haven't felt anything like that and we've been really happy so far.