Ever since I was a child, my sister has felt calm when she touched my crotch, and even now as an adult, she still touches me when she's feeling anxious. If she touches my dick that much, I'll get an erection! My sister doesn't stop touching it even though she says, "Don't make it bigger." One day, I said, "You're so mean, sister. Let me see it too," and she shyly showed me her naked body and let me touch it. I got super excited seeing my sister naked for the first time, and I got a full erection! My sister also got excited and forced me to cum inside her three times in a row in the cowgirl position, leaking sperm!