MIAB-545 "If I pee and ejaculate, it's not cheating, right?" When I asked my girlfrie

My gyaru sister Amiri has found out that I'm worried about the sex with my girlfriend not going well! She's definitely just killing time and messing around with me for fun, but she grins and says, "I'll take a look at your boyfriend's dick, lol," and plays with it! With my cock rock hard, she gives me a handjob that stops me from ejaculating! I'm a premature ejaculator, so she teases me until I pee my pants! Even though I have a girlfriend, she says, "It's not cheating unless I cum with all my might," and seduces me with a handjob! Just nipple play...