Is it normal to steal lost panties?

I was working with a flooring company who was a friend of my dads. We got to the job and met the homeowners wife she was so hot nice tits great big milf ass some what see through leggings and had a very flirty vibe. The floor we were replacing was in the master bedroom the first day the room was sealed up tight very clean nothing out of place. Every day after that I noticed the wife’s underwear drawer was slightly open she had panties on top of her dresser a pair hanging out all where we would be walking past all day. Of course being young I got horny I picked them up touched them sniffed them every day I came back a new pair was hanging out or on top of the dresser. Finally one of the days close to finish we moved her dresser close to some clear tarps we had up to keep the dust out. The next morning I came in and Next to her dresser by the opening of the plastic was a pair of panties what looked to be placed there for a reason. Throughout the day I again touched them sniffed them and when it got to the end of the day which would be our last day there I took them shoved them down my pants. I got this instant horny rush come over me the whole ride home I rubbed them all over my dick and the second I got home masturbated with them I’ve never came so hard and fast it was awesome. I used them 3 times that day and every time after. I started to feel a bit of guilt I have since been back to the job quickly where she seemed to be more flirty than ever. Do I keep the panties or tell her I took them and apologize? I feel guilty but in a way sense she knows I have them and she enjoys it. Help!