Been sleeping with a friends wife

My friends that got married 3 years ago, that I’m currently living with have been having 3somes with me almost daily. Well, there has been a bit of a development in this strange situation. So the other night the 3 of us had some more fun and its feeling more natural each time we play, BUT!!! I have no Idea where the line is being drawn.Until recently we have only ever played with her husband around, and it’s been so much fun. The other day she came home from work and she was already flirting and giving me hints that she wanted to fuck, I flirted back and things got a little touchy, at some point I grabbed her from behind and stuck my hand down her pants to play with her pussy. I wasn’t going to go past this point, I just wanted to tease her a little so she was hot and ready for when her husband gets home she would push for 3some to happen. Of course, she was soaking wet, my fingers went right in. she asked me, “want to fuck?” I said, “how about your husband?” She brushed it off and said, “He’s not going to be home for about an hour and it’s not wrong as long as I take care of him too when he gets home."We paused not sure what the right thing to do. She walked into my room and took off her panties and bent over the bed wiggling her ass back on forth like a naughty kitty cat. I drop my pants, grabbed my already hard cock and with no lube, just her already wet pussy I slid into her, filling her up with my cock. Pounding her pussy from behind I grab her waisting and pull her hair. The little whore starts to yell scream and talking dirty. Fuck me! fuck your friend’s wife, fuck his little slut, talks about how tight her pussy is. started to squeeze her pussy muscles to make it tighter. I flip her over on her back and start fucking her, she was holding her legs up and apart and then I noticed her wedding ring on her left hand. This is the first time I have ever noticed it because we have always had sex in the dark because her husband is shy and turns out the lights. I pulled out and she turned to suck my cock as I pumped her mouth full of cum and she swallows each drop of my cum. something I know for a fact she doesn’t do because her husband is always complaining that shes never swallows.and of course he gets home and none of us act as if anything happened.