A stranger surprises two young girls having sex in nature and joins them

While I was walking in the woods, I accidentally found two sexy young girls having sex! I couldn't believe what I was seeing, two gorgeous lesbians completely naked and licking pussy! My cock immediately got super hard and so I started masturbating while I was watching them. But why limit myself to this? So I waited for the right moment and, when one of the girls was in doggy to lick the other girl, I silently approached and without saying anything I stuck my cock in her pussy! After a moment of disorientation and fear, the girl began to enjoy and that was the beginning of a wild threesome