The first time with my sister "Seed...Brother, that's enough, I'm so excited. Ah, ah... I'm going to cum."

She bent down and gave me a blowjob immediately. At the moment that I didn't have time to set up But suddenly felt a tingling all over the cock It made me almost helpless., At that time, I was very shocked. But it was really tingling. The first feeling I got was...is this? Is it like this?