My son almost got us caught!

My 14-year-od son and I have been having sex for a couple of months now, right under my husband's nose. I prefer to only do it when he is out of the house, but my son often has other ideas, and once he gets me worked up I find it very hard to say no to him. Last week I was taking a shower and he came into the bathroom (the lock on the door was broken), I told him it was occupied but he said he wanted to join me in the shower and started taking off his clothes. I told him we couldn't since his father was home and I promised we could have sex tomorrow afternoon before he got home from work, but my son ignored me and got in the shower with me, drawing the curtains closed after. I continued arguing but soon his hands were on me and he had a finger in my pussy, he really knows how to push my buttons so I knew how this was going to turn out. Just then my husband entered the bathroom too! I told him I was showering but he said that was no problem, he just needed to shave. He couldn't see us behind the curtain and my son took care not to make noise, but his finger was still in my pussy and he was pushing it deeper. My husband started talking to me about something mundane as he shaved and I had to have a conversation with him (while secretly hoping he'd leave), but as I was talking I felt the finger leave my pussy and then something much bigger start to enter it. I tried to get my son to take it out but he proceeded to penetrate me with his cock, right there less than 5 feet away from his father, separated only by a shower curtain. I had to use all my concentration to continue the conversation with my husband while my son was pushing his cock deeper into my pussy, it took a lot of effort to stop any moans from coming out. He continued to talk to me and I tried to limit my responses to short one-word answers so my voice wouldn't give me away, at least he was fucking me with long slow strokes so it was just about possible to keep myself under control. After about a minute of this he made me cum and I couldn't stop myself from letting out a little gasp, my husband asked what was wrong and I said it was a headache. Finally he finished up and left, and at that point my son sped his strokes up and came in me, giving me another orgasm in the process. I scolded him for what he did afterward and told him never to do anything that stupid again, but it did turn me on a lot and I couldn't wait for the next afternoon either, I paid him a visit in his bed that night after my husband was asleep.