Ночной присмотр за детьми: нарушение границ или норма?

I was put in a “situation “ last night and need advice to see if it’s as serious as my husband thinks or not. I work for a preschool, and we do before and after care. Sometimes parents ask us teacher to babysit on the weekends due to work shifts or something. Well yesterday I watched two kiddos. An 8 year old boy and 3 year old girl and it ended up dad asking me to keep them over night due to a situation. So I dod, (I need the money) at bed time I blew up an air mattress and put it in my sons room with him and the siblings were to sleep on the one bed and my son was in his bed. My son and the girl fell asleep fast and the 8 year old was watching a movie. Me and my husband were in the living room (right outside of the bedroom) and we heard him giggling and stuff and my husband checked on him and he moved to my sons bed and had him arm around him. My husband lost it and got so angry. He pulled me aside and told me he wasn’t aloud to sleep in there anymore. So I moved him out and slept in the living room and he slept on my pull out couch. My husband was so angry and said it was weird and he was “groping “ our son. I don’t think it was that serious ..: I think he was just to wake him up and maybe bother him while he was sleeping. Still not something nice to do regardless but they weren’t under the blankets together or anything and my son’s clothes were fine and he was on his stomach asleep. I’m so upset and we’ve been arguing silently through text all night so no kids can hear it. Thoughts?