Last night I got home and ended up seeing my youngest [20] fucking his older brother [23]. They didn't hear me come home and don't know I saw them yet. When I saw it I wasn't really mad at all, kind of happy seeing my boys having such a nice relationship with each other. The only thing I was worried about was if they were using condoms. Luckily I saw he was wearing a condom. I could clearly see that they were enjoying it, both of them had very hot faces while fucking. I continued to watch until they finished up and started kissing.

What do I do now? I want to talk to them about it but I'm not sure what to say or how to do it. Any help is appreciated!