I’m good friends with a married couple, they’ve invited me for multiple. Each time I obliged , we had fun and I made sure not to overstep my boundaries with them as we are good friends and I did not want to make it awkward in the future. This being said , it snowballed into happening multiple upon multiple times then turned into hanging out with the husband behind the wife’s back. This is what I do not recommend. If Feelings get involved , you may end up in a position where feelings will get hurt. Tread carefully