I thought my girlfriend's adult sister Karin was a quiet, innocent woman, but she was secretly insatiable. “It isn't cheating if I only stroke it,” she whispered, and somehow I let myself believe her. Even with my girlfriend asleep beside us, I fell for Karin's handjob honey trap. Her devilish expressions and skilled hands made me cum again and again, until my balls were completely drained—and then I spent the trip fucking my girlfriend's sister like crazy.